Patent ID: 9303932
Filing Date: 2016-04-05
CPC Classification: F41A

Claim Text:
1. A firearm with both gas-delayed and stroke piston action; the firearm comprising an internal component assembly including a barrel, a bolt, a piston, a piston connector, a connecting arm assembly, recoil springs, a rear gas port, a rear piston area, a trigger mechanism, a firing pin, a forward gas port having a larger diameter than the rear gas port, and a forward piston area, the internal component assembly fitting within a receiver; and the internal component assembly further including an ammunition cartridge including a primer, powder and a bullet, a forward end of the bullet being positioned immediately adjacent to the rear gas port at the back of the barrel; wherein, when the trigger mechanism is manually activated, the firing pin strikes the primer from behind the cartridge, the striking of the primer causing an explosion of the powder, a firing of the bullet from the cartridge, and a generating of propellant gas in the barrel and into the adjacent rear gas port immediately after firing, the bullet separating from the cartridge and being propelled through the barrel; wherein, when pressure from the propellant gas generated by the explosion of the powder in the cartridge flows into the rear gas port and the rear piston area, the propellant gas pressure from the rear piston area forces and holds the piston, the connecting arm, and the bolt in a forward position, the piston being physically connected to the bolt by the connecting arm and the piston connector, inertial rearward movement of the bolt is then delayed due to the propellant gas pressure from the rear piston area keeping the bolt in a forward position immediately after firing of the bullet until the propellant gas pressure in the barrel reaches the forward gas port and the propellant gas pressure in the barrel returns to near ambient; wherein, when the bullet approaches the barrel exit, propellant gas rushes from the barrel through the forward gas port and into the forward piston area, the propellant gas thus moving rearward and the larger diameter of the forward gas port in comparison to the rear gas port allowing the propellant gas pressure from the forward piston area to overpower the propellant gas pressure from the rear piston area, with the propellant gas pressure from the forward piston area forcing the piston and the bolt rearward, the bolt in its rearward movement functioning to extract and eject the empty cartridge from the firearm; wherein, once the bolt is forced completely rearward, the bolt is then forced forward by the recoil springs; the forward-moving bolt picking up another ammunition cartridge from the magazine, and the bolt and the cartridge being seated for another shot.