| US282194A              (en) |  | 1883-07-31 |  | Auxiliary rifle-barrel and extractor therefor | 
| US496231A              (en) |  | 1893-04-25 |  | Magazine-gun | 
| US541560A              (en) |  | 1895-06-25 |  | Sight for firearms | 
| US802279A              (en) | 1902-02-13 | 1905-10-17 | Rudolf Frommer | Firearm. | 
| US861939A              (en) | 1907-02-21 | 1907-07-30 | Laurence V Benet | Gas-operated gun. | 
| US1065341A              (en) | 1913-03-20 | 1913-06-24 | John M Browning | Take-down construction for firearms. | 
| US1143170A              (en) | 1913-11-26 | 1915-06-15 | John M Browning | Firearm. | 
| US1125937A              (en) | 1913-12-27 | 1915-01-26 | Laurence V Benet | Automatic shoulder-rifle. | 
| US1150756A              (en) | 1915-06-26 | 1915-08-17 | Gustav G Gocke | Recoil-register. | 
| US1266087A              (en) | 1917-07-02 | 1918-05-14 | Richard M Williams | Gun attachment. | 
| US1474209A              (en) | 1921-10-14 | 1923-11-13 | Robert V R Reynolds | Gauge | 
| US1517328A              (en) | 1923-02-08 | 1924-12-02 | Weiss Karl | Coupling for subcaliber or practice barrels | 
| US2364487A              (en) | 1942-08-22 | 1944-12-05 | Colt S Mfg Co | Firearm accessory | 
| US2779119A              (en) | 1956-01-18 | 1957-01-29 | George R Fawcett | Automatically operated variable shotgun choke | 
| US2951424A              (en) | 1956-08-14 | 1960-09-06 | Fairchild Engine & Airplane | Gas operated bolt and carrier system | 
| US2902933A              (en) | 1958-08-25 | 1959-09-08 | Moldofsky Matthew | Subcaliber training cartridge | 
| GB891448A              (en) | 1959-09-09 | 1962-03-14 | Staatsbedrijf Artillerie Inric | Improvements in and relating to hand guards for rifles | 
| US3075314A              (en) | 1959-09-09 | 1963-01-29 | Staatsbedrijf Artillerie Inric | Hand guard for rifles | 
| US3198076A              (en) | 1963-03-22 | 1965-08-03 | Rhoda Jeanne Stoner | Convertible gun | 
| US3543429A              (en) | 1967-05-10 | 1970-12-01 | Paul Bendele | Kits for adapting old percussion revolvers to fire modern cartridges | 
| US3721031A              (en) | 1970-08-24 | 1973-03-20 | Us Navy | Underwater repeating shotgun | 
| US3793922A              (en) | 1973-01-22 | 1974-02-26 | R Angell | Collet-chamber retarding system for weapons | 
| US4090305A              (en) | 1975-10-22 | 1978-05-23 | James Lawrence Cassidy | Precision rifle sight adjuster | 
| US4304061A              (en) | 1979-05-21 | 1981-12-08 | D.W.A. Associates, Inc. | Firearm barrel, shroud construction | 
| US4742636A              (en) | 1986-02-11 | 1988-05-10 | Eastman Kodak Company | Mount for mounting an optical sight on a firearm | 
| US4765224A              (en) | 1986-08-15 | 1988-08-23 | Morris Michael C | Automatic rifle gas system | 
| US4845871A              (en) | 1988-04-19 | 1989-07-11 | Swan Richard E | Attachment device | 
| US4841657A              (en) | 1988-05-09 | 1989-06-27 | O. F. Mossberg & Sons, Inc. | Smooth bore firearm having axially rotatable barrel | 
| US5142806A              (en) | 1991-09-23 | 1992-09-01 | Swan Richard E | Universal receiver sleeve | 
| US5225615A              (en) | 1992-01-28 | 1993-07-06 | Wesson Firearms Co., Inc. | Compensated barrel shroud | 
| US5343650A              (en) | 1992-03-30 | 1994-09-06 | Swan Richard E | Extended rigid frame receiver sleeve | 
| US5198600A              (en) | 1992-05-20 | 1993-03-30 | Havis-Shields Equipment Corporation | Mount for rifle | 
| USRE35381E              (en) | 1992-07-13 | 1996-11-26 | Browning | Ballistic optimizing system for rifles | 
| US5276988A              (en) | 1992-11-09 | 1994-01-11 | Swan Richard E | Buffered attachment device | 
| US5412895A              (en) | 1993-03-09 | 1995-05-09 | Krieger; John M. | Floating gun barrel mount | 
| US5553329A              (en) | 1994-06-07 | 1996-09-10 | E.D.C. Sarl | Crash helmet for motorcyclists and the like, provided with a safety device for locking the visor | 
| US5590585A              (en) | 1995-05-29 | 1997-01-07 | Funai Electric Co., Ltd. | Bread maker | 
| US5595602A              (en) | 1995-08-14 | 1997-01-21 | Motorola, Inc. | Diffuser for uniform gas distribution in semiconductor processing and method for using the same | 
| US5661255A              (en) | 1995-11-07 | 1997-08-26 | Briley Manufacturing Co. | Weapons barrel stabilizer | 
| US5729927A              (en) | 1996-03-22 | 1998-03-24 | Shaver, Jr.; Gerald Lee | Firearm adapter device and cartridge carrier for use therein | 
| US6044748A              (en) | 1996-10-18 | 2000-04-04 | Armalite, Inc. | Breech bolt assembly for a firearm | 
| US5740626A              (en) | 1997-04-03 | 1998-04-21 | Olympic Arms, Inc. | Modified firearms for firing simulated ammunition | 
| US5826363A              (en) | 1997-07-10 | 1998-10-27 | Knights Armament Company | Rail adapter handguard systems for firearms | 
| US6345464B1              (en) | 1999-01-13 | 2002-02-12 | Surefire, Llc | Firearms with target illuminators, electric switching devices and battery power sources | 
| US6321477B1              (en) | 1999-03-31 | 2001-11-27 | The United States Of America As Represented By The Secretary Of The Navy | Adjustable and locking rifle mounting system | 
| US6418655B1              (en) | 1999-08-19 | 2002-07-16 | Ira M. Kay | Underbarrel shotgun | 
| US6293040B1              (en) | 1999-08-27 | 2001-09-25 | Defense Procurement Manufacturing Services, Inc. | Interchangeable weapon receiver for alternate ammunition | 
| US6295751B1              (en) | 2000-05-26 | 2001-10-02 | Charles J. Piwonski | Flare attachment for a firearm with a removable barrel | 
| US6634128B1              (en) | 2000-10-04 | 2003-10-21 | Laszlo Vastag | 0.22 caliber long rifle removable conversion system kit for black powder cap and ball reproduction and replica revolver—recreation and gallery shooting | 
| US20020116857A1              (en) | 2001-02-23 | 2002-08-29 | Franz Wonisch | Firearm | 
| US6490822B1              (en) | 2001-03-09 | 2002-12-10 | Richard E. Swan | Modular sleeve | 
| US6499245B1              (en) | 2001-03-09 | 2002-12-31 | Richard E. Swan | Modular sleeve yoke | 
| USRE39465E1              (en) | 2001-03-09 | 2007-01-16 | Swan Richard E | Modular sleeve yoke | 
| USRE40216E1              (en) | 2001-03-09 | 2008-04-08 | Swan Richard E | Modular sleeve | 
| US6508027B1              (en) | 2001-10-02 | 2003-01-21 | Surefire, Llc | Accessory mounts for firearms | 
| US6618976B1              (en) | 2001-12-10 | 2003-09-16 | Richard E. Swan | Drop-in laser | 
| US6671990B1              (en) | 2002-02-13 | 2004-01-06 | Vern H. Booth | Rifle handguard system with single end attachment | 
| US20150135572A1              (en) | 2002-03-25 | 2015-05-21 | David Stanowski | Rifle handguard system with integrated barrel nut | 
| USRE45185E1              (en) | 2002-03-25 | 2014-10-14 | David Stanowski | Rifle handguard system with integrated barrel nut | 
| US6694660B1              (en) | 2002-03-25 | 2004-02-24 | Robert B. Davies | Rifle handguard system with integrated barrel nut | 
| US7963203B1              (en) | 2002-05-07 | 2011-06-21 | Davies Robert B | Rifle | 
| US20160195360A1              (en) | 2002-05-07 | 2016-07-07 | Davies Innovations Inc. | Rifle | 
| US9322609B2              (en) | 2002-05-07 | 2016-04-26 | Davies Innovations Inc. | Rifle | 
| US20150247699A1              (en) | 2002-05-07 | 2015-09-03 | David R. Stanowski | Rifle | 
| US8707850B1              (en) | 2002-05-07 | 2014-04-29 | David R. Stanowski | Rifle | 
| US20120285317A1              (en) | 2002-05-07 | 2012-11-15 | Robert Bruce Davies | Rifle | 
| US7827722B1              (en) | 2002-05-07 | 2010-11-09 | Davies Robert B | Rifle | 
| US8037806B2              (en) | 2002-05-07 | 2011-10-18 | Davies Robert B | Rifle | 
| US6848351B1              (en) | 2002-05-07 | 2005-02-01 | Robert B. Davies | Rifle | 
| US6860053B2              (en) | 2002-06-01 | 2005-03-01 | Ned F. Christiansen | Grip friction pattern | 
| US6606812B1              (en) | 2002-06-13 | 2003-08-19 | Mack W. Gwinn, Jr. | Firearm barrel change apparatus | 
| US6959509B2              (en) | 2002-08-26 | 2005-11-01 | George Vais | Quick change infinitely adjustable barrel nut assembly | 
| US6769209B2              (en) | 2002-10-03 | 2004-08-03 | Hector Mendoza-Orozco | Removable interior barrel adaptable in an interior of an original barrel for ammunition or pellets for sport rifles | 
| US6895708B2              (en) | 2003-05-29 | 2005-05-24 | Surefire, Llc | Accessory mounts for firearms | 
| US6854206B2              (en) | 2003-06-24 | 2005-02-15 | T.D.I. Arms Systems, Ltd. | Rail connector and method | 
| US7356962B2              (en) | 2003-10-16 | 2008-04-15 | Swan Richard E | Low profile flip up site | 
| WO2005047801A2              (en) | 2003-11-17 | 2005-05-26 | Acsa - Advanced Combat Systems Accessories Ltd. | Multi-accessory incorporation firearm grip | 
| US7204052B2              (en) | 2004-01-23 | 2007-04-17 | Swan Richard E | Detachable mount for a telescopic firearm sight | 
| US7458179B2              (en) | 2004-03-26 | 2008-12-02 | Swan Richard E | Modular panel system for attaching accessories to a firearm rail system | 
| US20160131447A1              (en) | 2004-06-16 | 2016-05-12 | Colt's Manufacturing Company Llc | Automatic or semi-automatic rifle | 
| US8051595B2              (en) | 2004-06-16 | 2011-11-08 | Colt Defense, Llc | Automatic or semi-automatic rifle | 
| US8640372B2              (en) | 2004-06-16 | 2014-02-04 | Colt Defense, Llc | Automatic or semi-automatic rifle | 
| US20070033851A1              (en) | 2004-06-16 | 2007-02-15 | Paul Hochstrate | Automatic or semi-automatic rifle | 
| US9279632B2              (en) | 2004-06-16 | 2016-03-08 | Colt's Manufacturing Ip Holding Company Llc | Automatic or semi-automatic rifle | 
| US7059076B2              (en) | 2004-06-25 | 2006-06-13 | Abrahms Airborne Manufacturing | Firearm rail system | 
| US7363741B2              (en) | 2004-07-06 | 2008-04-29 | Desomma Frank | Hand guard assembly for firearms | 
| US7584567B1              (en) | 2004-07-06 | 2009-09-08 | Desomma Frank | Hand guard assembly for firearms | 
| US8069604B2              (en) | 2004-07-29 | 2011-12-06 | Larue Mark C | Hand-guard / barrel nut clamp assembly for tactical firearm | 
| US20070017139A1              (en) | 2004-07-29 | 2007-01-25 | Larue Mark C | Hand-guard / barrel nut clamp assembly for tactical firearm | 
| US7941959B1              (en) | 2005-01-05 | 2011-05-17 | Swan Richard E | Modular integrated rail assembly for firearms | 
| US7707762B1              (en) | 2005-01-05 | 2010-05-04 | Swan Richard E | Modular integrated rail assembly for firearms | 
| US20100095575A1              (en) | 2005-01-05 | 2010-04-22 | Swan Richard E | Modular integrated rail assembly for firearms | 
| US8276304B2              (en) | 2005-01-18 | 2012-10-02 | Samson Scott W | Modular fore-end rail assembly for firearms | 
| US20060260169A1              (en) | 2005-01-18 | 2006-11-23 | Samson Manufacturing Corporation | Modular fore-end rail assembly for firearms | 
| US20060162217A1              (en) | 2005-01-24 | 2006-07-27 | Longueira Dino C | Interchangeable caliber semi-automatic rifle | 
| US20070261285A1              (en) | 2005-02-11 | 2007-11-15 | Troy Stephen P | Modular hand grip and rail assembly for firearms | 
| US7216451B1              (en) | 2005-02-11 | 2007-05-15 | Troy Stephen P | Modular hand grip and rail assembly for firearms | 
| WO2006103062A1              (en) | 2005-03-30 | 2006-10-05 | Heckler & Koch Gmbh | Fastening system for fixing a component to a small arm and small arm comprising such a system | 
| WO2006138106A2              (en) | 2005-06-16 | 2006-12-28 | Colt Defense, Llc | Improved rifle | 
| KR20130076902A              (en) | 2005-06-16 | 2013-07-08 | 콜트 디펜스 엘엘씨 | Improved rifle | 
| KR101564570B1              (en) | 2005-06-16 | 2015-10-30 | 콜트 디펜스 엘엘씨 | Improved Rifle | 
| KR101358970B1              (en) | 2005-06-16 | 2014-02-06 | 콜트 디펜스 엘엘씨 | Improved Rifle | 
| KR20080036988A              (en) | 2005-06-16 | 2008-04-29 | 콜트 디펜스 엘엘씨 | Enhanced rifle | 
| CA2612519A1              (en) | 2005-06-16 | 2006-12-28 | Colt Defense, Llc | Improved rifle | 
| KR20140056391A              (en) | 2005-06-16 | 2014-05-09 | 콜트 디펜스 엘엘씨 | Improved rifle | 
| KR20080034454A              (en) | 2005-08-10 | 2008-04-21 | 헤클러 운트 코흐 게엠베하 | Adapter component | 
| CA2616472A1              (en) | 2005-08-11 | 2007-02-15 | Heckler & Koch Gmbh | Weapon and cooling system for a weapon | 
| KR20080034451A              (en) | 2005-08-11 | 2008-04-21 | 헤클러 운트 코흐 게엠베하 | Weapon and weapon cooling systems | 
| US20150007477A1              (en) | 2005-09-19 | 2015-01-08 | Colt's Manufacturing Company Llc | Firearm having a removable hand guard | 
| US7523580B1              (en) | 2005-11-07 | 2009-04-28 | Jerome Benedict Tankersley | Handguard system integrated to a firearm | 
| US7640689B2              (en) | 2005-11-17 | 2010-01-05 | Heckler & Koch Gmbh | Hand guard system for use with a firearm | 
| EP1949014A1              (en) | 2005-11-17 | 2008-07-30 | Heckler & Koch GmbH | Hand guard arrangement, barrel arrangement and weapon | 
| CA2625261A1              (en) | 2005-11-17 | 2007-05-24 | Heckler & Koch Gmbh | Hand guard arrangement, barrel arrangement and weapon | 
| US20090013579A1              (en) | 2005-11-17 | 2009-01-15 | Norbert Fluhr | Hand guard system for use with a firearm | 
| KR20080067345A              (en) | 2005-11-17 | 2008-07-18 | 헤클러 운트 코흐 게엠베하 | Hand protection, barrel device and weapon | 
| US8028456B2              (en) | 2006-02-06 | 2011-10-04 | Ashbury International Group, Inc. | Detachable visual augmentation device (VAD) mounting bracket for firearms and optical devices | 
| US20100269392A1              (en) | 2006-02-08 | 2010-10-28 | Swan Richard E | Lower hand guard with heat shield for use with a modular integrated rail system | 
| US7775150B2              (en) | 2006-02-09 | 2010-08-17 | Colt Defense Llc | Law enforcement carbine with one piece receiver | 
| US20070199435A1              (en) | 2006-02-09 | 2007-08-30 | Paul Hochstrate | Law enforcement carbine with one piece receiver | 
| US20100300277A1              (en) | 2006-02-09 | 2010-12-02 | Colt Defense, Llc | Law enforcement carbine with one piece receiver | 
| US20110303082A1              (en) | 2006-02-09 | 2011-12-15 | Paul Hochstrate | Firearm with gas operating system | 
| US20130047832A1              (en) | 2006-02-09 | 2013-02-28 | Paul Hochstrate | Firearm with gas operating system | 
| WO2008060310A2              (en) | 2006-02-09 | 2008-05-22 | Colt Defense Llc | Law enforcement carbine with one piece receiver | 
| EP1998134A2              (en) | 2006-02-09 | 2008-12-03 | Colt Defense LLC | Receiver for a rifle | 
| US8783160B2              (en) | 2006-02-09 | 2014-07-22 | Colt's Manufacturing Company Llc | Firearm with gas operating system | 
| US20140076152A1              (en) | 2006-02-09 | 2014-03-20 | Paul Hochstrate | Firearm with gas operating system | 
| US20110016762A1              (en) | 2006-02-23 | 2011-01-27 | Robert Bruce Davies | Rifle handguard system with integrated barrel nut | 
| US20080092422A1              (en) | 2006-05-24 | 2008-04-24 | Daniel Defense, Inc. | Systems and Methods for Providing a Hand Guard and Accessory Mounting Device for a Firearm | 
| US7716865B2              (en) | 2006-05-24 | 2010-05-18 | Daniel Defense, Inc. | Systems and methods for providing a hand guard and accessory mounting device for a firearm | 
| US7464496B1              (en) | 2006-05-26 | 2008-12-16 | Davies Robert B | Heat exchanger barrel nut | 
| US7905041B1              (en) | 2006-09-29 | 2011-03-15 | Davies Robert B | Stabilized rifle barrel and rifle | 
| WO2008103193A2              (en) | 2006-10-06 | 2008-08-28 | Colt Defense Llc | Firearm having removable modules | 
| US8453364B2              (en) | 2006-10-06 | 2013-06-04 | Colt Defense Llc | Firearm having a removable hand guard | 
| US8919025B2              (en) | 2006-10-06 | 2014-12-30 | Colt's Manufacturing Company Llc | Firearm having a removable hand guard | 
| US20120132068A1              (en) | 2006-10-06 | 2012-05-31 | Colt Defense, Llc | Firearm having a removable hand guard | 
| US20130263732A1              (en) | 2006-10-06 | 2013-10-10 | Grzegorz Kucynko | Firearm having a removable hand guard | 
| US9228799B2              (en) | 2006-10-06 | 2016-01-05 | Colt's Manufacturing Company Llc | Firearm having a removable hand guard | 
| US7757422B1              (en) | 2006-11-02 | 2010-07-20 | Swan Richard E | Mounting assembly with adjustable spring tension | 
| US7757423B1              (en) | 2006-11-02 | 2010-07-20 | Swan Richard E | Mounting assembly with adjustable spring tension | 
| US7493721B2              (en) | 2006-12-10 | 2009-02-24 | Swan Richard E | Mounting assembly with positive stop for actuator arm | 
| US8336243B2              (en) | 2007-04-09 | 2012-12-25 | Colt Defense Llc | Firearm having a removable hand guard | 
| US8776420B2              (en) | 2007-04-09 | 2014-07-15 | Colt's Manufacturing Company Llc | Firearm having a removable hand guard | 
| US20100212201A1              (en) | 2007-07-18 | 2010-08-26 | Abrams Airborne Manufacturing | Adaptive configuration for a firearm | 
| US7676975B2              (en) | 2007-08-16 | 2010-03-16 | Breaching Technologies, Inc. | Tactical foregrip assembly | 
| US20090044439A1              (en) | 2007-08-16 | 2009-02-19 | Breaching Technologies, Inc. | Tactical foregrip assembly | 
| US8234809B2              (en) | 2007-09-20 | 2012-08-07 | Daniel Defense, Inc. | Systems and methods for installing a hand guard on a firearm | 
| US20120005936A1              (en) | 2007-09-20 | 2012-01-12 | Daniel Defense, Inc. | Systems and methods for installing a hand guard on a firearm | 
| US8046949B1              (en) | 2007-09-20 | 2011-11-01 | Daniel Defense, Inc. | Systems and methods for installing a hand guard on a firearm | 
| WO2009082520A2              (en) | 2007-09-20 | 2009-07-02 | Daniel Defense, Inc. | Systems and methods for installing a hand guard on a firearm | 
| US20110252625A1              (en) | 2007-09-20 | 2011-10-20 | Daniel Defense, Inc. | Systems and methods for installing a hand guard on a firearm | 
| EP2191224A2              (en) | 2007-09-20 | 2010-06-02 | Daniel Defense, Inc. | Systems and methods for installing a hand guard on a firearm | 
| US20100282066A1              (en) | 2007-10-22 | 2010-11-11 | Jerome Benedict Tankersley | Gas block and installation device | 
| US20120096755A1              (en) | 2008-01-14 | 2012-04-26 | Todd Griffin | Rail accessory mounting apparatus for weapon | 
| WO2009131721A2              (en) | 2008-01-14 | 2009-10-29 | R/M Equipment, Inc. | Rail accessory mounting apparatus for weapon | 
| US7793452B1              (en) | 2008-01-22 | 2010-09-14 | Samson Manufacturing Corporation | Modular fore-end rail assembly with locking mechanism | 
| US7770317B1              (en) | 2008-06-24 | 2010-08-10 | Jerome Benedict Tankersley | Handguard system with clamp device | 
| EP2141441A2              (en) | 2008-07-01 | 2010-01-06 | Adcor Industries, Inc. | Firearm including improved hand guard | 
| US8141285B2              (en) | 2008-07-01 | 2012-03-27 | Adcor Industries, Inc. | Firearm including improved hand guard | 
| US8561335B2              (en) | 2008-07-01 | 2013-10-22 | Adcor Industries, Inc. | Firearm including improved hand guard | 
| US20120317859A1              (en) | 2008-07-01 | 2012-12-20 | Adcor Industries, Inc. | Firearm including improved hand guard | 
| US20120036756A1              (en) | 2008-07-01 | 2012-02-16 | Adcor Industries, Inc. | Firearm including improved hand guard | 
| US8141289B2              (en) | 2008-07-09 | 2012-03-27 | Lwrc International, Llc | Top opening, modular top rail, multi-rifle adaptable free float rail adaptor system (ARM-R) | 
| US20130055613A1              (en) | 2008-07-09 | 2013-03-07 | Lwrc International Llc | Top opening, modular top rail, multi-rifle adaptable free float rail adaptor system (arm-r) | 
| US8689477B2              (en) | 2008-07-09 | 2014-04-08 | Lwrc International Llc | Top opening, modular top rail, multi-rifle adaptable free float rail adaptor system (ARM-R) | 
| US20120042557A1              (en) | 2008-07-09 | 2012-02-23 | Darren Mellors | Top opening, modular top rail, multi-rifle adaptable free float rail adaptor system (arm-r) | 
| US20100126054A1              (en) | 2008-09-22 | 2010-05-27 | Daniel Defense, Inc. | Hand Guard Assembly for Securely Attaching to a Firearm | 
| US8359779B2              (en) | 2008-09-22 | 2013-01-29 | Daniel Defense, Inc. | Hand guard assembly for securely attaching to a firearm | 
| US8205373B1              (en) | 2008-12-08 | 2012-06-26 | Nordic Components | Rimfire action platform conversion | 
| US8713838B2              (en) | 2008-12-08 | 2014-05-06 | Nordic Components | Rimfire action platform conversion | 
| US20120137563A1              (en) | 2008-12-08 | 2012-06-07 | Ubl Timothy R | Rimfire action platform conversion | 
| US8141287B2              (en) | 2008-12-30 | 2012-03-27 | Smith & Wesson Corp. | Lightweight, low cost semi-automatic rifle | 
| US20100175293A1              (en) | 2009-01-11 | 2010-07-15 | Steve Hines | Two piece rail system for firearm | 
| US8201353B1              (en) | 2009-01-14 | 2012-06-19 | Swan Richard E | Modular hand guard assembly | 
| US8316574B1              (en) | 2009-01-14 | 2012-11-27 | Swan Richard E | Modular hand guard and lighting assembly | 
| US8037633B1              (en) | 2009-02-20 | 2011-10-18 | Troy Stephen P | Handguard system for firearms | 
| US20120131834A1              (en) | 2009-03-24 | 2012-05-31 | Sturm, Ruger & Company, Inc. | Firearm with quick coupling barrel system | 
| US20120216439A1              (en) | 2009-03-24 | 2012-08-30 | Sturm, Ruger & Company, Inc. | Firearm with quick coupling barrel interlock system | 
| US8240074B2              (en) | 2009-03-24 | 2012-08-14 | Sturm, Ruger & Company, Inc. | Method for mounting firearm barrel | 
| US20150007478A1              (en) | 2009-03-24 | 2015-01-08 | Jonathan Barrett | Firearm with quick coupling barrel system | 
| US8087194B1              (en) | 2009-03-24 | 2012-01-03 | Sturm, Ruger & Company, Inc. | Firearm barrel retaining system | 
| US20120131835A1              (en) | 2009-03-24 | 2012-05-31 | Sturm, Ruger & Company, Inc. | Quick coupling barrel system for firearm | 
| US20110061281A1              (en) | 2009-04-30 | 2011-03-17 | Smith & Wesson Corp. | Firearm hand guard rail system | 
| US8276303B2              (en) | 2009-04-30 | 2012-10-02 | Smith & Wesson Corp. | Firearm hand guard rail system | 
| US20100287809A1              (en) | 2009-05-15 | 2010-11-18 | The Otis Patent Trust | Integrated rail system and method for making and using same | 
| US8028460B2              (en) | 2009-05-15 | 2011-10-04 | The Otis Patent Trust | Integrated rail system and method for making and using same | 
| US8726557B2              (en) | 2009-06-22 | 2014-05-20 | Ra Brands, L.L.C. | Hand guard attachment system for firearms | 
| WO2010151552A1              (en) | 2009-06-22 | 2010-12-29 | Ra Brands, L.L.C. | Hand guard attachment system for firearms | 
| CA2765149A1              (en) | 2009-06-22 | 2010-12-29 | Ra Brands, L.L.C. | Hand guard attachment system for firearms | 
| US20100319231A1              (en) | 2009-06-22 | 2010-12-23 | Stone Jeffrey W | Hand guard attachment system for firearms | 
| EP2634522A1              (en) | 2009-06-22 | 2013-09-04 | Ra Brands, L.L.C. | Firearm with removably mounted hand guard | 
| EP2446214A1              (en) | 2009-06-22 | 2012-05-02 | Ra Brands, L.L.C. | Hand guard attachment system for firearms | 
| US8230634B1              (en) | 2009-07-02 | 2012-07-31 | Robert Bruce Davies | Two piece upper receiver for firearms | 
| US20120117845A1              (en) | 2009-07-02 | 2012-05-17 | Desomma Frank | Two piece upper receiver for firearms | 
| US20110214327A1              (en) | 2009-07-02 | 2011-09-08 | Desomma Frank | Two piece upper receiver for firearms | 
| US20110000119A1              (en) | 2009-07-02 | 2011-01-06 | Desomma Frank | Two piece upper reciever for firearms | 
| US20120190358A1              (en) | 2009-10-01 | 2012-07-26 | Nec Corporation | Mobile communication system, base station apparatus, mobile station apparatus, control method, and computer readable medium | 
| US20110099869A1              (en) | 2009-11-05 | 2011-05-05 | Bentley James K | Dynamic magazine latch | 
| US20110119981A1              (en) | 2009-11-20 | 2011-05-26 | Larue Mark C | Tactical firearm having heat shielding properties and improved gas energized cartridge feeding | 
| US8347540B2              (en) | 2009-12-01 | 2013-01-08 | Sig Sauer, Inc. | Handguard system for firearms | 
| US20110126443A1              (en) | 2009-12-01 | 2011-06-02 | Sig Sauer, Inc. | Handguard system for firearms | 
| US20110167701A1              (en) | 2010-01-12 | 2011-07-14 | The Otis Patent Trust | Rotatable mount for integrated rail system and method for using same | 
| US8739448B2              (en) | 2010-01-14 | 2014-06-03 | Apex Machining Company, Inc. | Handguard systems for firearms | 
| US20110192066A1              (en) | 2010-01-14 | 2011-08-11 | Apex Machining Company, Inc. | Handguard systems for firearms | 
| US8429845B1              (en) | 2010-01-19 | 2013-04-30 | Richard E. Swan | Modular integrated rail system including a dampening device | 
| US8726558B1              (en) | 2010-03-31 | 2014-05-20 | Aero Precision, Inc. | AR-15 handguard system | 
| US20110239513A1              (en) | 2010-04-02 | 2011-10-06 | Sandman James A | Modular rail attachment system | 
| US20110247254A1              (en) | 2010-04-12 | 2011-10-13 | Barnes Andrew S | Attachment assembly for firearm handguard and method of attaching handguard to a firearm | 
| US8667883B1              (en) | 2010-05-06 | 2014-03-11 | Rock River Arms, Inc. | Firearm having gas piston system | 
| US20150007712A1              (en) | 2010-05-06 | 2015-01-08 | Rock River Arms, Inc. | Firearm Having Gas Piston System | 
| US8468929B2              (en) | 2010-05-06 | 2013-06-25 | Rock River Arms, Inc. | Firearm having gas piston system | 
| USD637684S1              (en) | 2010-05-07 | 2011-05-10 | Apex Machining Company, Inc. | Firearm handguard | 
| US8307751B2              (en) | 2010-05-12 | 2012-11-13 | Teludyne Tech Industries, Inc. | Weapons system construction and modification including improved gas management system | 
| DE102010023466A1              (en) | 2010-06-13 | 2011-12-15 | Schmeisser Gmbh | Hand protection for a weapon | 
| US8230633B1              (en) | 2010-06-28 | 2012-07-31 | Sisk Charles H | Multiple rifle recoil lugs | 
| US8397416B2              (en) | 2010-09-28 | 2013-03-19 | Smith & Wesson Corp. | Multi-caliber bolt-action rifle and components | 
| US20120073177A1              (en) | 2010-09-28 | 2012-03-29 | Thompson/Center Arms Company, Inc. | Multi-caliber bolt-action rifle and components | 
| US9140520B2              (en) | 2010-10-28 | 2015-09-22 | John M. Lopes | Firearm and chassis system | 
| US9010009B2              (en) | 2010-11-01 | 2015-04-21 | The Otis Patent Trust | Eccentric rail nut and eccentric rail mounting system | 
| US8844186B2              (en) | 2010-11-18 | 2014-09-30 | Centurion Arms, LLC | Firearm hand guard | 
| US20120124880A1              (en) | 2010-11-18 | 2012-05-24 | Leclair Lamonte L | Firearm Hand Guard | 
| US8448367B2              (en) | 2011-01-13 | 2013-05-28 | Samson Manufacturing Corporation | Modular fore-end rail/hand guard assembly system for firearms with selectable heat dissipation characteristics | 
| US20120186123A1              (en) | 2011-01-14 | 2012-07-26 | Troy Stephen P | Firearm handguard system | 
| US8464457B2              (en) | 2011-01-14 | 2013-06-18 | Troy Industries, Inc. | Firearm handguard system | 
| US9032659B1              (en) | 2011-03-08 | 2015-05-19 | Scott A. Duneman | Rotatable forearm/hand-guard assembly for a firearm | 
| US8667882B1              (en) | 2011-05-06 | 2014-03-11 | Rock River Arms, Inc. | Firearm | 
| US8985007B2              (en) | 2011-05-06 | 2015-03-24 | Rock River Arms, Inc. | Firearm | 
| US8578642B2              (en) | 2011-05-09 | 2013-11-12 | Troy Industries, Inc. | Drop-in handguard system | 
| US20120324775A1              (en) | 2011-05-09 | 2012-12-27 | Troy Stephen P | Drop-in handguard system | 
| US8607490B1              (en) | 2011-05-12 | 2013-12-17 | Brendon B Zinsner | Quick release hand guard assembly for a rifle | 
| WO2013010515A1              (en) | 2011-07-21 | 2013-01-24 | Proarms Armory, S.R.O. | Arrangement to fasten the rail lower handguard on a long gun | 
| CZ303588B6              (en) | 2011-07-21 | 2012-12-27 | Proarms Armory S. R. O. | Arrangement for attachment of rail fore-stock for long firearms | 
| US8528246B2              (en) | 2011-07-22 | 2013-09-10 | Robert Saurman | Forward hand guard assembly for rifle | 
| US20130019513A1              (en) | 2011-07-22 | 2013-01-24 | Matthew Telles | Forward Hand Guard Assembly for Rifle | 
| US8991092B2              (en) | 2011-08-11 | 2015-03-31 | The Otis Patent Trust | Method and apparatus for splitting a delta ring on a rifle | 
| US20130097910A1              (en) | 2011-10-21 | 2013-04-25 | Daniel Defense, Inc. | Systems, Methods, and Apparatuses for Installing a Hand Guard on a Firearm | 
| US8806793B2              (en) | 2011-10-21 | 2014-08-19 | Daniel Defense, Inc. | Systems, methods, and apparatuses for installing a hand guard on a firearm | 
| US20130180151A1              (en) | 2012-01-13 | 2013-07-18 | Universal Quality Machine Llc | Barrel nut mounted mounting structure for a rifle accessory item and system comprising same | 
| US9003686B2              (en) | 2012-02-13 | 2015-04-14 | Adcor Industries, Inc. | Hand guard mounting mechanism | 
| US8689478B2              (en) | 2012-02-14 | 2014-04-08 | Swetal K. Patel | Quick take-down barrel system and method for modular rifle | 
| US20130205637A1              (en) | 2012-02-14 | 2013-08-15 | Swetal K. Patel | Quick Take-Down Barrel System and Method for Modular Rifle | 
| US20150241166A1              (en) | 2012-03-13 | 2015-08-27 | Stephen Charles Hines | Powered Forward Module | 
| US9279639B2              (en) | 2012-03-13 | 2016-03-08 | Stephen Charles Hines | Powered forward module | 
| US20150135576A1              (en) | 2012-04-20 | 2015-05-21 | Surefire, Llc | Accessory mounting hand guard for firearm | 
| US9476672B2              (en) | 2012-04-20 | 2016-10-25 | Surefire, Llc | Accessory mounting hand guard for firearm | 
| US8595970B2              (en) | 2012-04-20 | 2013-12-03 | Surefire, Llc | Accessory mounting hand guard for firearm | 
| US8739449B2              (en) | 2012-07-02 | 2014-06-03 | Swetal K. Patel | High strength upper receiver system and method for modular rifle | 
| US20140000142A1              (en) | 2012-07-02 | 2014-01-02 | Swetal K. Patel | High Strength Upper Receiver System and Method for Modular Rifle | 
| US8806792B2              (en) | 2012-07-27 | 2014-08-19 | Leapers, Inc. | Firearm handguard components, assembly and method for forming the same | 
| US20140026459A1              (en) | 2012-07-27 | 2014-01-30 | Leapers, Inc. | Firearm Handguard Components, Assembly and Method for Forming the Same | 
| US20140075817A1              (en) | 2012-07-31 | 2014-03-20 | Jesus S. Gomez | Barrel nut assembly and method to attach a barrel to a firearm using such assembly | 
| US20160084596A1              (en) | 2012-07-31 | 2016-03-24 | Lwrc International Llc | Firearm receiver assemlby | 
| US9140506B2              (en) | 2012-07-31 | 2015-09-22 | Lwrc International Llc | Firearm receiver assembly | 
| US20140076146A1              (en)* | 2012-07-31 | 2014-03-20 | Jesus S. Gomez | Firearm receiver assemlby | 
| US20150143730A1              (en) | 2012-07-31 | 2015-05-28 | LHR Sporting Arms, LLC | Muzzle-loading firearm with a mono block and retaining nut | 
| US20140033590A1              (en) | 2012-07-31 | 2014-02-06 | Lwrc International, Llc | Barrel nut assembly and method to attach a barrel to a firearm using such assembly | 
| US20140033588A1              (en) | 2012-07-31 | 2014-02-06 | LHR Sporting Arms, LLC | Muzzle-Loading Firearm with a Removable, Threadless Breech Plug | 
| US8839545B1              (en) | 2012-08-08 | 2014-09-23 | J & K Ip Assets, Llc | Rifle guard rapid configuration system | 
| WO2014031593A2              (en) | 2012-08-24 | 2014-02-27 | Ra Brands, L.L.C. | Firearm with forward grip attachment system | 
| US20140068987A1              (en) | 2012-08-24 | 2014-03-13 | Ra Brands, L.L.C. | Firearm with forward grip attachment system | 
| US9297609B2              (en) | 2012-08-24 | 2016-03-29 | Ra Brands, L.L.C. | Firearm with forward grip attachment system | 
| US20140076147A1              (en) | 2012-09-14 | 2014-03-20 | Mark C. LaRue | Tactical firearm having heat shielding properties and improved gas energized cartridge feeding | 
| US20140076148A1              (en) | 2012-09-14 | 2014-03-20 | Mark C. LaRue | Tactical firearm having heat shielding properties and improved gas energized cartridge feeding | 
| US9234717B2              (en) | 2012-10-26 | 2016-01-12 | Ra Brands, L.L.C. | Quick detach barrel mounting system | 
| US20150247695A1              (en) | 2012-10-26 | 2015-09-03 | Ra Brands, L.L.C. | Quick detach barrel mounting system | 
| US8782943B2              (en) | 2012-10-26 | 2014-07-22 | Ra Brands, L.L.C. | Quick detach barrel mounting system | 
| WO2014066759A1              (en) | 2012-10-26 | 2014-05-01 | Ra Brands, L.L.C. | Quick detach barrel mounting system | 
| US20140115938A1              (en) | 2012-10-26 | 2014-05-01 | Ra Brands, L.L.C. | Quick Detach Barrel Mounting System | 
| CA2889273A1              (en) | 2012-10-26 | 2014-05-01 | Ra Brands, L.L.C. | Quick detach barrel mounting system | 
| US20140130390A1              (en) | 2012-11-12 | 2014-05-15 | William H. Geissele | Modular rifle handguard | 
| US20140144059A1              (en) | 2012-11-12 | 2014-05-29 | WHG Properties, LLC | Modular rifle handguard | 
| US8819980B2              (en) | 2012-11-12 | 2014-09-02 | WHG Properties, LLC | Modular rifle handguard | 
| US8601734B1              (en) | 2013-01-17 | 2013-12-10 | Alcor Scientific, Inc. | Pivoting firearm handgrip | 
| US8726559B1              (en) | 2013-01-25 | 2014-05-20 | Stephen Mark Mueller | Universal barrel nut for firearm | 
| US20160010946A1              (en) | 2013-01-26 | 2016-01-14 | Kevin W. Gibbens | Weapon handguard | 
| US8863426B1              (en) | 2013-01-31 | 2014-10-21 | Brendon B. Zinsner | Quick-release hand guard assembly for a rifle | 
| US8769853B1              (en) | 2013-05-08 | 2014-07-08 | Mark C. LaRue | Quick-detatchable handguard mechanism for firearms | 
| DE102013208770A1              (en) | 2013-05-13 | 2014-11-13 | Sitec Systemtechnik GmbH | Rifle, especially assault rifle | 
| DE102013008241A1              (en) | 2013-05-15 | 2014-11-20 | Goetz Coenen | Hand protection for a weapon | 
| US9279638B2              (en) | 2013-05-24 | 2016-03-08 | Knight's Armament Company | Rifle forend with integrated barrel nut | 
| US20140345179A1              (en) | 2013-05-24 | 2014-11-27 | Knight's Armament Company | Rifle forend with integrated barrel nut | 
| US9464864B2              (en) | 2013-06-20 | 2016-10-11 | Hardened Arms Llc | Rifle internal accessory mounting apparatus, system, and method | 
| US20150247700A1              (en) | 2013-06-20 | 2015-09-03 | Hardened Arms Llc | Rifle internal accessory mounting apparatus, system, and method | 
| US20140373419A1              (en) | 2013-06-25 | 2014-12-25 | Lamonte L. Leclair | Firearm Hand Guard | 
| US9157697B2              (en) | 2013-06-25 | 2015-10-13 | Centurian Arms, LLC | Firearm hand guard | 
| US8904691B1              (en) | 2013-07-25 | 2014-12-09 | Bravo Company Mfg, Inc. | Firearm handguard assembly | 
| US8931196B1              (en) | 2013-11-18 | 2015-01-13 | Mark C. LaRue | Firearm having capability for field assembly and disassembly | 
| US20150168092A1              (en) | 2013-12-12 | 2015-06-18 | Ra Brands, L.L.C. | Gas vent for firearm | 
| US20150168096A1              (en) | 2013-12-12 | 2015-06-18 | Mega Arms LLC | Integrated leveler and rail platform assembly for a firearm | 
| US9212865B2              (en) | 2013-12-17 | 2015-12-15 | Sig Sauer, Inc. | Hinged hand guard | 
| US20150168095A1              (en) | 2013-12-17 | 2015-06-18 | Sig Sauer, Inc. | Hinged hand guard | 
| US9200867B1              (en) | 2014-01-08 | 2015-12-01 | Richard E. Swan | Modular integrated powered handguard and accessory mount system for combat weapons | 
| EP2896927A1              (en) | 2014-01-10 | 2015-07-22 | Surefire, LLC | Accessory mounting hand guard for firearm | 
| EP2894431A1              (en) | 2014-01-13 | 2015-07-15 | Ra Brands, L.L.C. | Hand guard installation mechanism | 
| CA2877197A1              (en) | 2014-01-13 | 2015-07-13 | Ra Brands, L.L.C. | Hand guard installation mechanism | 
| US9464865B2              (en) | 2014-01-13 | 2016-10-11 | Ra Brands, L.L.C. | Hand guard installation mechanism | 
| US20150316347A1              (en) | 2014-01-13 | 2015-11-05 | Ra Brands, L.L.C. | Hand Guard Installation Mechanism | 
| US9303949B1              (en) | 2014-05-09 | 2016-04-05 | Paul Oglesby | Handguard attachment system having registration/retention tab | 
| US20150369555A1              (en) | 2014-06-24 | 2015-12-24 | Daniel Defense, Inc. | Systems and Methods for Mounting Barrels to Firearms | 
| US20160033225A1              (en) | 2014-07-29 | 2016-02-04 | Mike Selvetti | Removable Barrel and Hand Guard for Modular Rifles | 
| US20160054096A1              (en) | 2014-08-19 | 2016-02-25 | Beretta Usa Corp | Adjustable free-float forend/handguard mounting assembly | 
| US9557137B2              (en) | 2014-08-19 | 2017-01-31 | Beretta U. S. A. Corp. | Adjustable free-float forend/handguard mounting assembly | 
| WO2016028908A1              (en) | 2014-08-19 | 2016-02-25 | Beretta Usa Corp. | Adjustable free-float forend/handguard mounting assembly | 
| US9335117B2              (en) | 2014-09-30 | 2016-05-10 | Mega Arms LLC | Lock up system for a handguard | 
| US20160178316A1              (en) | 2014-09-30 | 2016-06-23 | Mega Arms, LLC | Method of locking a handguard to an upper receiver of a firearm | 
| US20160091276A1              (en) | 2014-09-30 | 2016-03-31 | Mega Arms, LLC | Lock up system for a handguard | 
| US20160153744A1              (en) | 2014-12-01 | 2016-06-02 | Wilcox Industries Corp. | Modular grenade launcher system | 
| WO2016089863A2              (en) | 2014-12-01 | 2016-06-09 | Wilcox Industries Corp. | Modular grenade launcher system | 
| US20160169617A1              (en) | 2014-12-15 | 2016-06-16 | Sig Sauer, Inc. | Hand guard for firearm | 
| US20160209166A1              (en) | 2015-01-15 | 2016-07-21 | Rock River Arms, Inc. | Integrated Rail and Sight System for Firearm | 
| US9964380B1              (en)* | 2015-01-16 | 2018-05-08 | Paul Oglesby | Rail accessory key attachment system | 
| US20160282069A1              (en) | 2015-03-25 | 2016-09-29 | Midwest Industries, Inc. | Firearm hand guard mounting assembly | 
| US20160282083A1              (en) | 2015-03-25 | 2016-09-29 | Midwest Industries, Inc. | Firearm Hand Guard Mounting Assembly | 
| US9453694B1              (en) | 2015-03-25 | 2016-09-27 | Midwest Industries, Inc. | Firearm hand guard mounting assembly | 
| US20160290761A1              (en) | 2015-04-02 | 2016-10-06 | Lancer Systems L.P. | Firearm handguard having heat-reducing features | 
| US9389043B1              (en) | 2015-06-05 | 2016-07-12 | Hongjun Zhang | Free floating rail for a firearm | 
| US20180180370A1              (en)* | 2016-12-25 | 2018-06-28 | Jing Zheng | Adjustable Gas System For Firearms | 
| US20180306551A1              (en)* | 2017-04-19 | 2018-10-25 | ZEV Technologies, Inc. | Barrel nut attached handguard | 
| US20180356181A1              (en)* | 2017-06-08 | 2018-12-13 | Springfield, Inc. | Free floating handguard anchoring system | 
| US10532447B2              (en)* | 2017-07-29 | 2020-01-14 | David M. Hamby | Combination castlenut and barrelnut socket adapter for use with torque creating devices | 
| US10345074B1              (en)* | 2018-02-23 | 2019-07-09 | Aleksey Zamlinskiy | Firearm chassis system | 
| US20200240737A1              (en)* | 2018-12-10 | 2020-07-30 | Maxim Defense Industries, LLC | Apparatus and method for regulating firearm discharge gases and mounting a component to a firearm |