| 摘要 |
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. The addition of a piston device attached to the muzzle end of the inner movable barrel causes added momentum to be delivered to the moving barrel to assist the barrel in its forward movement. This added momentum can be further enhanced by including a muzzle brake adjacent the piston device. The battering of the various parts of the firearm and the cycle speed of the firearm can be reduced by use of an air pressure chamber situated between the inner movable barrel, the receiver tube, the barrel guide and a shoulder on the inner movable barrel.
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