| 摘要 |
A recoil reducer for a shoulder firearm including a main piston that moves axially in a cylinder disposed in a cavity in the firearm stock to intersect the butt of the firearm, the main piston being connected via a piston rod to a plate that supports a shoulder pad spaced rearwardly of the butt such that major portions of the firearm can move rearwardly when the firearm is discharged. The main piston has an aperture formed therethrough, said aperture having a frusto-conical portion and a threaded portion to receive corresponding threaded and frusto-conical portions of the piston rod. A passage is formed through the main piston rod between the frusto-conical portion of said aperture and one side of the main piston to permit passage of fluid between the sides of the piston during recoil of the firearm and a spring biased follower piston is disposed in the cylinder rearwardly of the main piston to seal the cylinder against leakage of hydraulic fluid disposed in portions of the cylinder remote from the butt plate. The main piston further includes an axial bore that accepts a guide rod to prevent rotation of the main piston so that the spacing of frusto-conical portions of the piston rod and main piston aperture can be varied, to adjust the resistance to the passage of hydraulic fluid through the main piston, by turning the piston rod.
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