Patent ID: 6901689
Filing Date: 2005-06-07
Classification: F41A,F41B

Abstract:
1. For a conventional gun, a pneumatic recoil-spring cartridge providing a counter-recoil modulation action said cartridge comprising: a longitudinal cylindrical-wall having fixed first and second end-walls forming an imperforate gas chamber means, said second end-wall including a longitudinal bore with at least one continuous annular dynamic gas-seal means impinging upon a smoothly polished longitudinal piston-rod coaxially arranged and slidably there through, whereby a positive pressure is contained within said gas-chamber and acts to urge said piston-rod longitudinally outward of said second end-wall in a linear manner, plus a piston-flange portion fixed to said piston-rod inwardly of said second end-wall and acting to prevent complete passage of said piston-rod outward of said second end-wall; and, optionally, whereby the aggregate cylindrical-wall and co-acting piston-rod assembly are diametrically and lengthily sized to specifically occupy the particular gun cavity formerly housing the removed metal recoil-spring; and, wherein said first ea d-wall is in axial support of an opposing static-chamber piston member having an annular seal means impinging on said cylindrical-wall of said as-chamber, whereby an externally adjustable screw-threaded coaxial shank member abutting inwardly against the ambient facing side of said static-piston acts to enable a degree of user adjustment of said gas-chamber piston inward or outward relative to said gas chamber in order to tuneably compensate for different types of ammunition explosive energy which effects the recoil of the gun.