Jud?[mu I US. Department of Justice Bureau of Alcohol, Tobacco, Firearms and Explosives Firearms Technology Industry Services Branch avwnuyvum w" . Moniruburg. ll l' alf gov 06 zon new Dea (5) This refers to your correspondence, and sample ARI S-type ?Bump Fire Stock? to the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), Firearms Technology Industry Services Branch (PTISB), in which you ask for a review of your sample device and if it would be regulated by the provisions of the Gun Control Act of I968 (GCA) or the National Firearms Act (N FA). As background to our evaluation, the amended Gun Control Act of 1968 (GCA), 18 U.S.C. 921(a)(3), de?nes the term ??rearm" to include any weapon (including a starter gun) which will or is designed to or may be readily converted to expel a projectile by the action of an and] frame or receiver of any such weapon Further, the National Firearms Act (NFA), 26 U.S.C. 5845(b), de?nes ?machinegun? to mean-- weapon which shoots, is designed to shoot. or can be readily restored to shoot. automatically more than one shot, without manual reloading. by a single function of the trigger. The term shall also include the frame or receiver of any such weapon, any part designed and intended solely and exclusively. or combination of parts designed and intended, for use in converting a weapon into a machinegun, and any combination of parts from which a machinegun can be assembled if such parts are in the possession or under the control of a person. Your bump ?re grip device consists of the following: One AR-style pistol grip that it attached to and adjustable buttstock by a ?at metal bar bent to contour to the buttstock. The pistol grip has two plastic pieces attached by small screws, one is the extension for resting your ?nger on while ?ring and the other is a shield to prevent the pistol grip from pinching the grip ?ngers of the ?xing hand. 1861 (6) Your stock is designed to allow an AR-type semiautomatic ri?e mounted to it to reciprocate back and forth in a linear motion. The absence of an accelerator spring or similar component in the submitted device prevents it from Operating automatically. When operated, forward pressure must be applied with the support hand to the forward handguard/fore?cnd of the AR-type ri?e mounted to your stock, bringing the receiver assembly forward to a point where the trigger can be pulled by the ?ring hand. if suf?cient forward pressure is not applied to the handguard with the support hand, the ri?e can be ?red in a conventional, semiautomatic manner since the reciprocation of the receiver assembly is eliminated. The FTISB examination of the submitted device indicates that if as a shot is ?red?m a amount of pressure is applied to the handguard/gripping surface with the shooter's support hand-wthe AR-type rifle assembly will come forward until the trigger re-contacts the shooter?s stationary ?ring-hand trigger ?nger: Re-contacting allows the ?ring of a subsequent shot. in this manner, the shooter pulls the receiver assembly forward to ?re each shot, each succeeding shot ?ring with a single trigger ?inction. initiate an automatic ?ring cycle by a single ?rnction of the trigger, . . . .2 . punder the NFA, 26 u. s. c. 9? 5845(b), or the amended GCA, l8 U. C. We caution that our ?ndings are based on the item as submitted. Any changes to its design features or characteristics will void this classi?cation. Moreover, we should point out that the addition of an accelerator spring or any other non-manual source of energy which allows this device to operate automatically will result in the manufacture of a ?machinegun? as de?ned in the NFA, 5845(b). Submitted device 1862 Your device will be returned to you via your provided UPS shipping label. We thank you for your inquiry and trust the foregoing is responsive to your request. Sincerel ours, YY Michael R. Curtis Chief, Firearms Technology Industry Services Branch 1863 17981 (9) ?102 ?9 - 609170?6 GJH