FIELD: ammunition.
SUBSTANCE: claimed assembly comprises fixed guide rod with the butt and thread for lock nut, restoring compression spring shaped to accordion, lock washer, lock nut and thrust plug. Said restoring compression spring is shaped to a conical accordion with round coils of two, three and more areas. Spring coils are configured so that two, three and more adjacent coils are laid as-compressed in one plane, one in the other, while the coils of the entire spring are laid in horizontal and vertical planes in two, three and more rows. The spring is fitted on fixed guide rod the thrust against the piston frame channel.
EFFECT: simplified design and higher reliability.
3 cl, 6 dwg
