MUZZLE BRAKE Russian patent published in 2017 - IPC F41A21/32 

FIELD: weapon and ammunition.

SUBSTANCE: muzzle brake contains a body in the form of a central part for mounting a barrel on the muzzle with a hole for projectile discharge and a peripheral part with a cylindrical or conical outer surface. The central part of the hull is connected to the peripheral bridges with the formation of the through channels for the release of powder gases. A toroidal surface is made at the inner cavity front end of the muzzle brake peripheral part, a surface of a complex, streamlined shape, for example, in the form of a spherical surface is made on the end of the central part of the body.

EFFECT: simplifying the design of the muzzle brake, reducing weight, increasing the effectiveness of kickback damping.

2 dwg