An inexpensive generally retrofitable drop-in cartridge-unit of light-weight
pneumatic-cylinder
design for replacing the conventional metal/compression-spring member housed within
the frame of a gun, thereby providing significantly smoother, quiter, more rapid,
and more reliable cyclic-action upon firing of the gun. The preferred embodiment
cartridge-unit is internally configured whereby a near constant spring-load rise
is provided as the bolt-action slides aftward, thereby effectively spreading resultant
recoil-action inertial-kickback more evenly throughout the bolt-travel. Hence,
substantially reducing disturbing kickback, enabling a more rapid succession of
shots per given shot-grouping owing to the shooter's improved recovery-time. Various
iterations are set forth, including those of single, double, and tripple telescopic-action,
and a hybrid/metal-pneumatic variant, as well as generic-variants providing manual
and automatic pneumatic-pressure adjustment. Plus, a further iteration facilitating
manual adjustment of air-gun thrust-pressure.
