Nordic Components Shotgun Barrel Clamp, Designed for 12GA MXT Extensions, Compatible with Most 12GA Shotguns, Features 10-32 Threaded Hole On Each Side for Mounting Accessories and Rails, Not Compatible with Mossbergs, Benelli Nova/Super Nova BCL-12 Caliber: 12GA Finish/Color: Black Type: Shotgun Magazine Tube Components Manufacturer: Nordic Components Model: Mfg Number: BCL-12