The Awesome Adapter for Your 12-Gauge Shotgun That Turns It Into an 'Ultimate Survival Rifle
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
X-Caliber Shotgun Gauge Adapter System
Camber Adapters, Survival tool? Or just a gimmick? | Gun and Game Forum
ARMSLIST - For Sale/Trade: Survival Shotgun adapters and shotgun
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