FIELD: weapons and ammunition.
SUBSTANCE: proposed seal comprises breechblock wedge with groove filled with fluid, perforated barrel, differentiating ring piston, differentiating piston bead, rubber ring pressed to barrel breech end edge and steel oblique-split rings. Rings are locked in place by cover and barrel beads. Crank contacts with wedge by roller and, in closed position of breechblock, with piston of initial compression. Collar is fitted on piston of initial compression. Wedge houses compensator valve interacting, at breechblock open position, with breechblock end and communicating with compensator. Compensator comprises piston and spring. Bush rigidly and tightly jointed with barrel is fitted into barrel hole. It can displace therein within the limits of elastic strain. Collar is fitted on said bush.
EFFECT: longer life.
3 cl, 4 dwg
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