FIREARM Russian patent published in 2000 - IPC

FIELD: small arms, applicable for shooting live ammunition both for practice- training shooting by readily deformable bullets and for having a psychologic and physiological effects on offenders. SUBSTANCE: firearm has a frame, cartridge feeding mechanism, reloading mechanism, firing mechanism, standard barrel with a threaded section on the muzzle end for installation of muzzle attachments and a lock of their position, and an additional barrel aligned with the standard barrel, but outside its bore. The additional barrel has an internal cavity with a threaded section and through slots. It is installed on the muzzle thread of the standard barrel so that the muzzle end of the standard barrel projects behind the rear edge of the slots. The additional barrel is installed for axial displacement and variation of the clearance between the muzzle brake of the standard barrel and the front end of the slots, as well as for fixing its position by the catch of the standard barrel muzzle attachment. EFFECT: shooting from arms irrespective of the type of automatics and control of muzzle velocity of readily deformable bullet. 6 dwg