Breech bolt and lock assembly

Details Breech bolt and lock assembly Breech bolt and lock assembly

1995-08-14

1998-01-20

Carone, Michael J.

Ordnance

Automatic

Blow back breech block

89180, 89198, F41A 356

Patent

active

057103895

ABSTRACT:
A breech bolt and lock assembly for a gas-operated firearm is provided. The ssembly is contained within a bolt housing which in turn contains a bolt operating spring and a two-part bolt mechanism. The two-part bolt has a cylindrical outer bolt which encloses the inner bolt and firing pin. A second spring operates the firing pin. During firing, the inertia of the firing pin and inner bolt prevents the sudden rearward movement of the discharging cartridge. There is no other locking of the breech, however, the weight of the inner bolt and pin assembly may be changed to accommodate different propellant loads.

REFERENCES:
patent: 1484163 (1924-02-01), Vincon
patent: 2167672 (1939-08-01), Nomar
patent: 2401903 (1946-06-01), Browning
patent: 2549162 (1951-04-01), Blacker
patent: 3058400 (1962-10-01), Hailston et al.
patent: 3363351 (1968-01-01), Smith
patent: 3859745 (1975-01-01), Benelli
patent: 4161836 (1979-07-01), Hayashi
patent: 4270437 (1981-06-01), Donovan
patent: 4677897 (1987-07-01), Barrett
patent: 4922640 (1990-05-01), Toombs

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