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Miniature calibre (caliber) adapters and conversions
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X-Caliber Shotgun Gauge Adapter System
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The Utility of 12-Gauge Caliber Adapters, The Good, Bad, & Ugly -The Firearm Blog
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Cartridge Adapters | An Official Journal Of The NRA
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
Caliber conversion sleeve - Wikipedia
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X-CALIBER Survival-Rifle Gauge Adapter System - Soldier Systems Daily
