Chrosziel 410-44 110-98mm Step Down Adapter Ring 410-44 B&H
Rifled Shotgun Adapters - Gunadapters.com
Savage Arms "Four Tenner" .410 Shotgun Gauge Adapter - YouTube
X-CALIBER Survival-Rifle Gauge Adapter System - Soldier Systems Daily
Mossberg .410 AR Stock Adapter - Ergo Grip
Amazon.com: R410A Brass Straight Adapter AC Refrigeration Adapter for Air Conditioner Refrigerator Other Pneumatic Auxiliary Components (410 to British Standard) : Industrial & Scientific