Dry firing is the act of activating theshooting mechanism of abow,crossbow,firearm,airgun or other ranged weapons without actually launching out anyprojectiles. The expression is also used to refer to anyweapons training andtactical engagement simulation that does not involvelive firing ofammunitions.
Dry firing is most commonly done with firearms, and can be performed by simply cocking an unloaded gun and then actuate thetrigger to release thesear. It is however recommended to dry-fire using something to cushion thefiring pin strike, such as adummy round, a fake ammunition (commercially known as a "snap cap"), or simply the empty casing of a spentcartridge. There are also methods of interactive dry firing, usually with alaser pointer/infraredlight gun training platform such as an iMarksman or SIRT (Shot Indicating Resetting Trigger) training pistol, and may also include the use of a target feedback system, such as the iDryfire or LASR software.[1]
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The primary purpose of dry firing isweapons training, particularly to practiseform andkinematics oftrigger pull for betterprecisions (such as inshooting sports) as well astroubleshooting offirearm malfunctions duringrifle,shotgun andhandgun shooting. Dry firing is also performed ingunsmithing to test the working conditions of theaction in anaccurized orcustomized gun.
There are some benefits from the dry firing of contemporary fireams. Learning is safer with dry fire, and it's easier to conditionmuscle memories of trigger control without developing a flinch, which is a pre-emptivereflex some beginners tend to have due to anticipation to arecoil or being unaccustomed to the trigger weight. Dry firing also allows shooters to practice trigger control in locations where they can't use live ammo legally or practically, such as at home or in outdoor sites that are not up to thesafery standards ofshooting ranges. Grip, drawing, sight alignment, trigger control, reloads, troubleshooting malfunctions, and more can be trained during dry fire practice, which allow people to conduct a safe, convenient and cheap (as live ammo areconsumables that cost money to reprocure orreload after used) form of training to improve shooting skills.[2][better source needed]
In recent years, a number of companies have developed methods of enhancing dry fire practice to improve skills. Products that illuminate a laser beam, as opposed to a solid projectile, have become increasingly popular. These include chamber inserts available for various caliber firearms, as well as dedicated training pistols or replacement AR-15 bolt carrier groups. There are also a number of target systems for these laser dry fire training aides, that are becoming more affordable and popular. These products help people get more from dry fire practice by providing feedback on shot placement and times, and make dry fire a more enjoyable experience. In addition, there are training aids such as training cards that provide shooters a variety of drills to do that will help them develop skills that will carry over to live fire.[3]
In the context ofarchery, dry firing or "dry loosing" refers to the releasing of a drawnbow orcrossbow without a nocked or loaded arrow or bolt. This can be exceptionally hazardous to the weapon, as the force which would otherwise be used to drive the projectile (arrow or bolt) is instead absorbed by the weapon's frame.[4]This practice is often heavily discouraged as without the mass of the projectile to absorb theelastic energy released, the energy is instead dissipated through vibration of the bowstring and the bow limbs, and can do significant structural damage to the bow itself.Compound bows are particularly susceptible to damage due to high tension and numerous moving parts. Dry firing a modern high-energy compound bow even once may cause a combination of cracked limbs, bent axles, string derailment, cam warpage, string/cable failure, cable slide failure, and can even cause the bow to shatter. While some bows can survive a dry fire with no apparent damage, typically manufacturers do not warrant their bows for dry firing, and any bow that has been dry fired needs to be thoroughly inspected for damage before shooting again. In particular, the limbs need to be inspected for cracking around cam axles and the opening of the slot where the cams or pulleys fit in (since they tend to tilt sideways during a dry fire).
Crossbows, with even higher draw weights, are even more likely to be damaged by dry firing.
Concern is commonly expressed by firearms manufacturers and gunsmiths that dry firing might damage certain firearms.
It is generally considered acceptable to dry firecenterfire firearms for limited volume training, although older designs such as theCZ 52 andColt Single Action Army are exceptions. This is becausefiring pins are designed foraxialmomentum transfers via the tipimpacting aprimer, and dry-firing afiring pin into an emptychamber means that the decelerativeimpulse is mostly handled by protrusions orflanges on the pin (usually at the rear) catching the inside of thebolt, which conveys an eccentrictensile/shearingshock instead of an axialcompressive one, leaving parts of the pin more vulnerable towears due to repeated, concentratedstresses andmaterial fatigues. Ultimately, one should check with the manufacturer of the gun to ascertain if it is safe to dry fire, butdummy rounds,snap caps, a BarrelBlok or simply spent casings with inert primers should be used for all high-volume dry fire training.[5]
Although dry firing does not pose any real risk of damage to most modern centerfire firearms, it can certainly pose a risk forrimfire guns, where the firing pin are inherent designed to impact thebarrel's breech face (normally with the cartridge rim crushed in-between to cushion the impact) when the weapon is fired. Unless the gun'stolerances andmachining is so precise that the pin stopsjust short of contacting the breech — which is extremely difficult to achieve and maintain — dry-firing a rimfire gun with an empty chamber means that the firing pin will most likely impact the breech bluntly, potentially damaging either side or both.[6] Because of this, precautions (such as the use ofplastic orrubber snap caps) are recommended if a rimfire weapon is to be deliberately dry-fired.
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Some dummy cartridges are equipped with a laser beam (laser cartridge), usually with a red, green or infrared beam so that they can simulate the point of impact. There are also camera systems or other types of sensors to detect hits so that competitions can be simulated.[7] Special laser weapons or firearm conversion kits with or without simulated recoil are also available. Some examples of commercial laser training systems are iMarksman,[8] TTRIGGER,[9] SIRT,[10] iDryfire,[11] LASR (Laser Activated Shot Reporter),[12] MantisX,[13] LaserLyte,[14] Laser Ammo,[15] LaserHIT[16] or SCATT.[17] Some examples of open source solutions ShootOFF[18] and HomeLESS.[19]
Laser systems can have different technical solutions which are not necessarily compatible. The power of the laser beam is typically around 1-5 mW. The color of the laser is typically either green (520 nmwavelength), red (630-670 nm) or infrared (780 nm, invisible). Red and green lasers can be captured by most ordinary cameras, while special camera may be needed to capture infrared lasers since most ordinary cameras have an infrared filter.
The SIRT (Shot Indicating Resetting Trigger) models from Next Level Training were one of the first major manufacturers of pistol dry training systems, and since then similar products have also been offered by many other manufacturers. Some laser systems have several lasers in the same unit. One such example is the SIRT 110, which has one laser (take-up laser, can be deactivated[20]) that lights up as long as the trigger is pressed past the reset point, and another laser (shot indicator) that lights up after the trigger has been fully triggered and as long as it is held. These two laser beams are supplied by SIRT in combination red/red or red/green respectively, and on the red/green variant the color mapping can be changed by the user with a button. There are also laser modules[21] on the aftermarket so that the SIRT 110 can be converted to other laser colors (infrared/red, meaning that one laser is invisible) for use with an infrared camera that captures wavelengths between 780-940 nm. Using two different laser beams means that a camera system can capture movements in the weapon before and after the shot is fired. Laser pistols used in modern pentathlon have been standardised to have red lasers with a wavelength of 635 to 650 nm.[22]
The pulse duration of the laser is measured inmilliseconds (ms), and is important for correct detection by target or camera systems. Some systems have user-adjustable pulse lengths.[23] With purely electromechanical dryfire cartridges the duration of the pulse is often mechanically controlled by the firing pin and typically lies around 100 ms, while some other systems have digitally controlled pulses that are shorter, for example 60 ms[24] or 1 ms.[25] These may be required for camera or target systems to be able to correctly detect single shots, and stands in contrast to laser systems that emit a continuous laser beam as long as the trigger is held, such as the SIRT 110. There are also aftermarket conversion kits or pulse modules to convert some laser systems to emit a distinct pulse for use with particular target systems. For example, one manufacturer[26][27] offers an aftermarket module that is required for use with their target systems, and has a stated pulse duration of 65 ms.[28] Another manufacturer[29] offers a pulse module that emits a 30 ms pulse with each trigger pull, and claims that it works with target systems from both LASR, Laser Ammo and LaserLyte. Laser pistols used inmodern pentathlon have been standardised since 2014 to having a pulse length of 15.6 ms. Before 2014 the pulse length was standardised to 25.2 ms.[30]Laser systems for use with simulated recoil have a very short pulse[31] (in the order of magnitude 6-8 milliseconds[32]) to ensure that the point of impact is not affected too much by the movement in the firearm. This can require the use ofhigh-speed cameras (for example 200 fps), since many ordinary web and phone cameras don't have a quick enoughframe rate.[33]
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Recorded from the 1980s,[34] the term "dry fire" was possibly coined as analogous to the phrase "dry run", which is a rehearsal or testing process and in the case of the firearm, one is "testing" the trigger action and observing the hammer or striker drop, without using live ammunition.[speculation?]For the expression of "dry run", it has been suggested that the "dry" originates from exhibitions by late-19th-century fire departments in theUnited States, where drills (runs) were conducted for public viewing without the use of water (dry).[35]
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