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Shotgun Adapter 12 Gauge to 22 LR - Gunadapters.com
Gear Review: TRU-BORE 12 Gauge Chamber Adapter
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
Chiappa Firearms X-Caliber 4 Caliber Adapter Kit for 20 Gauge | $9.01 Off w/ Free Shipping