Patent ID: 8245625

Claim:
A gas pressure mechanism that receives and supplies gas pressure to an auto-loading firearm during the firearm's reloading operation, said gas pressure mechanism comprising: a pair of twin body members symmetrically adapted to nestle against a firearm's barrel, each twin body member comprising a front cylinder in fluid communication with a rear cylinder; wherein each of said rear cylinders include a rear gas port for fluid communication with an interior of the barrel such that gases of combustion is bled through each of said rear gas ports from the interior of the barrel to the interior of the rear cylinders, wherein said rear gas ports are situated for fluid communication with the front of the firearm's shell chamber in a rear region of the barrel in order to capture and receive the gas pressure developed immediately behind a shell load as it travels through the barrel after firing and deliver the gas pressure forward to the front cylinder, wherein each of said front cylinders include a front gas port for fluid communication with the interior of the shotgun barrel such that the gas pressure delivered from said rear cylinder passes through the front gas ports and is received in the front cylinders to recoil and counter-recoil the shotgun's piston to its rear most position, said front cylinder further includes a pressure release hole as a means of releasing excess gas pressure from the mechanism, said pressure release hole is covered by said piston until said piston is in its rear most position, an adjustment cap member having a stop, wherein said cap member selectively adjusts a cap end in a rearward or forward direction to selectively partially cover said front gas ports in order to control the volume of gas pressure that enters and is released through the front gas ports and into said front cylinders.