Abstract: A foldable firearm stock for use with a grenade launcher or other weapon. A hinged butt portion, when moved into the folded configuration releases the lock permitting the stock frame to pivot from an extended position to a storage position above and aligned with the weapon barrel.

Abstract: A grenade launcher and attachment for use on an infantry weapon, such as a rifle. The launcher fires grenades of the type which have a hollow tubular rear chamber slidably mounted on a guide rod and a piston head fitted into the bore of the chamber to seal an explosive charge therein and form an extensible explosion chamber. Locking elements for silently installing the grenade launcher without the use of complex tools are provided. Recoil buffering or compensation is provided to minimize the perceived recoil when grenades or other projectiles are launched from a shoulder held firing position. A detent is provided to secure projectiles on the guide tube until they are fired.