The SOPMOD kit is composed mostly ofnon-developmental items andcommercial off-the-shelf (NDI/COTS) accessories packaged together to support four M4A1 carbines.[2][3] It allows for the attachment of any Picatinny compatible accessory that fits the length of the weapon.
The program dates back to September 1989, when the Special Operations Special Technology (SOST)Modular Close Combat Carbine Project was founded. This was the first program to standardize components from the 1970s/1980s era of "duct tape and hose clamps". TheMaterial Need Statement (MNS) was signed in May 1992 and, by September 1993, theOperational Requirements Document (ORD) for the program was validated. Responsibility for the program was then assigned to theNaval Surface Warfare Center Crane Division.[2][4]
Aimpoint ECOS-N (Enhanced Combat Optical Sight-Navy), a variant of theCompM2 using the Wilcox Aimpoint CompM mount instead of the standard issue QRP mount
Tactical Ordnance and Equipment Improved Combat Sling, which allows for secure cross body/patrol carry.
Visible Bright Light II (VBL II) (based on the older genSurefire M962C model, replacement for the Insight VLI)[6]
High Reliability Magazines (HRM) steel and aluminum[3][7]
If more of the accessories are needed, it is typical for units to "cannibalize" the kits of inactive teams. The documentation for the kit does not require a rewrite if improved replacements for any of the current items can be found. As a result, this content list has changed over time. Several potential additions include the KACMasterkey Shotgun, theM26 Modular Accessory Shotgun System, and theM320 grenade launcher.[3] Also, variousEOTech holographic sights, prominently EOTech 551s and 552s are used on many SOPMOD configured M4s.[citation needed]
SOPMOD Block IIUS Army75thRangers using multiple Block II accessories on their rifles at night. Note the Insight WMX 200 light mounted on the rifle of the operator on the right.
The MDNS (Miniature Day-Night Sight) program included the Block I Phased Replacement components and the Block II components[13]
Daniel Defense M4A1 RIS II (Rail Interface System), GL/SSC RIS II (Grenade Launcher/Sound Suppressor Capable), and MK18 RIS II (with FSP (front sight post) variations) free-float handguards[8][9][10][11]
Insight M3X VBL III Gun Light (SU-233/PVS), replacement for the VBL II
Insight M6X VBL III Integrated Gun Light (SU-238/PVS), replacement for the VBL II
