Could a 12 gauge shotgun shell be fired from a 12 gauge marine plastic flare gun without blowing up? - Quora
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The Shooters Box 20 Gauge to 45 Colt RIFLED Caliber Adapter 3" *For Use In Break Barrels Only* - Oley's Armoury
Could the use of 'adapters' which fit into the chamber and swapping of the bolt, extractor and other parts allow firearms to use different calibers as long as the new cartridge is
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