driving attachment for firearms (1) provided with a bolt. The accessory drive includes a drive bolt (3) and a training barrel (2). Normal bolt of the firearm (1) may be replaced by the drive yoke (3) and the training barrel (2) can be inserted into the barrel (6) of the firearm (1 ). The handle (11) of the drive yoke (3) comprises a cartridge of pressurized gas, and upon initiation of the firearm (1) a valve member (10) is actuated to release a certain amount of gas, which is directed through a passage (35) against a projectile (19) housed in the bore (23) for driving the barrel (2), which propels the projectile (19) outside gun (1). This training accessory reduces the costs of shooting training, including indoors, with firearms normally intended for the use of ammunition containing a powder charge.
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