Dewey Thread Adapter Converts 5 x 40 Male to 8 x 32 Female Brass
Donny FL · 1/2 x 20 Adapter A99 · AEA Challenger Pro – AEA Airguns Shop
SHOT Show 2015: Chiappa X-Caliber Survival Rifle/Shotgun - The Truth About Guns
Amazon.com : StrongTools Plastic Adapters Universal Red and Green Boresighter Suitable for .17 to 12GA Calibers (Universal Adapters, 2 Packs) : Sports & Outdoors
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.