Gas operated firearm with metering adjustment

Ordnance – Automatic – Breech block lock

Patent

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Details

89191A, 89193, F41D 508

Patent

active

039889645

ABSTRACT:
A gas operated firearm capable of at least semi-automatic operation, the firearm including a receiver having a barrel connected thereto, the barrel including a bore with a plurality of radially extending ports through the barrel from the bore. A breach bolt is mounted for reciprocation in the receiver and is adapted for abutting registration in a first position with the cartridge chamber, and includes a locking lug for maintaining the bolt in position abutting the cartridge, when the cartridge is in the chamber. A slide is mounted for reciprocation on the receiver and includes a camming surface which cooperates with the cam on the bolt for unlocking the bolt and effecting reciprocation of the bolt in the receiver upon the slide being drawn to the rear of the firearm. An annular piston registers with the terminal forward end of the slide, the piston circumscribing the barrel and being slidably mounted for movement therealong, the skirt portion of the piston being spaced radially from the barrel and overlying the gas ports in the barrel. A gas flow adjuster or sleeve is mounted for axial displacement along the barrel to, if desired, at least partially cover the ports, thereby permitting metering of the flow of gas to the piston, or restrict such flow entirely if single shot operation is desired, when operating the firearm.

REFERENCES:
patent: 1802816 (1931-04-01), Holek
patent: 1892141 (1932-12-01), Garand
patent: 2211405 (1940-08-01), Browning
patent: 3273460 (1966-09-01), Mason
patent: 3329064 (1967-07-01), Segrest
patent: 3382766 (1968-05-01), Seiderman
patent: 3443477 (1969-05-01), Kaempf
patent: 3611867 (1971-10-01), Silsby

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