12ga to 22LR rifled shotgun adapters Gunadapters - YouTube
Short Lane Gun Adapters Stack-N-Pack Kit: Turning a 12 Gauge into a Truly Versatile Weapon
Eagle Gun Range -Macon GA - X-Caliber Ammo Adapter Set for Shotguns. It's an 8-piece set of drop-in adapters that measure seven inches long each, and it comes with a carrying case.
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