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22 long rifle action adjustment aircraft airplane ammunition automatic pistol Aviation Ordnanceman back plate barrel extension battery belt feed block blowback bolt moves bomb bay bomb hoist bomb release system bomber bombsight bore breech lock breech plug bullet caliber 30 chamber clean compressed designed downward driving spring drop the bombs electrical explosion extractor fastened feed mechanism Figure firing pin fixed guns flexible guns forward end fresh cartridge fuze gage gas cylinder gas-operated grip safety grooves hammer headspace hits hoisting bands hole intervalometer loaded magazine manual mounted moves back moves backward notch oil buffer pivoted plane position pounds pull pushed racks and shackles rear receiver recoil spring recoil-operated release mechanism release pawl rifle rounds per minute semi-automatic side skid slanting sleeve slide moves slot solenoid Springfield Springfield rifle sub-machine gun suspension hooks switch Thompson sub-machine gun tridge trigger bar trunnion tube underside weapon Winchester carbine