FIREARM SYSTEMS AND METHODS Russian patent published in 2022 - IPC F41A15/14 

FIELD: armament.

SUBSTANCE: firearm contains a bolt with a set of combat protrusions, which are made with a cut area, which is more than a cut area in standard weapon M16/M4. A bolt frame contains a bolt, which has a cam with a double cut, and contains an unlocking cam surface, which has a sufficient increase in a concentrical part of a cam curve for delaying the unlocking beginning, when the bolt frame is used in a carbine of M4. A step ejector pin is installed, which prevents the disconnection of the ejector pin. A pipe allows for gas supply from a barrel of the firearm to a piston through a key of the bolt frame. The pipe is equipped with a heat dissipator, which is formed of triangular-shaped incisions on parts of the pipe. On the bolt, there is a piston with rings, including pairs of mated rings, which are formed and held in the form of a selected pair.

EFFECT: increase in the safety, prevention of powder gas break and overheating of structure elements, increase in the reliability, provision of control of a fire rate of small arms.

22 cl, 111 dwg