Robert W Irwin

US Patent:

51233290, Jun 23, 1992

Filed:

Oct 4, 1990

Appl. No.:

7/592974

Inventors:

Robert M. Irwin - Las Vegas NV

International Classification:

F41A 520

US Classification:

89161

Abstract:

The present invention comprises a self-actuating blow forward firearm having a fixed breech block located to the rear of the firearm. A cartridge feeder provides a supply of cartridges to the loading area so that the firearm can be used as an automatic or semi-automatic weapon. The firearm also contains an outer receiver tube and a movable inner gun barrel which is biased toward the rear of the firearm by a spring disposed in a chamber between the receiver tube and the inner movable barrel. When the trigger mechanism is activated, the action of the bias spring causes the inner movable barrel to move backward toward the breech block striping a cartridge from the feeding device and forcing the end of the cartridge against the firing pin on the breech block. The bullet is fired down the bore of the inner movable barrel. The movement of the bullet along the bore of the inner movable barrel drags the barrel forward against the action of the bias spring.

US Patent:

39903460, Nov 9, 1976

Filed:

Feb 18, 1975

Appl. No.:

5/550275

Inventors:

Robert M. Irwin - Las Vegas NV

International Classification:

F41D 300
F41D 508

US Classification:

89180

Abstract:

An improved gas locked firearm using expanding gases to force a bullet through a barrel in which a portion of said gases are diverted through a gas port communicating with a gas locking chamber adjacent said barrel which chamber is formed between said barrel and an extension arm of the bolt or breech block extending forward therefrom a distance along the rear portion of the barrel and forming an elongated gas chamber between a shoulder on the rear of the barrel and a plate extending from said breech block extension in a manner to trap the expanding gases between said barrel shoulder and said plate to lock the breech block in a forward position while gas pressure exists in the barrel and provided with additional gas ports in the breech block extension and plate to vent remaining gases as the firearm action cycles.