The tactical shotgun mag tube extension magazine clamp/barrel clamp for shotguns with a sling stud swivel mount fits all 12 gauge shotguns. The shotgun magazine clamp strengthens the connection between the 12 gauge shotgun extension tube and the barrel of the shotgun. This magazine clamp for shotguns includes a sling swivel stud that is reversible for right-handed or left-handed shooters. The magazine clamp can be used to secure a 1 inch diameter tactical shotgun flash light or laser sight to the barrel or mag tube. This shotgun magazine clamp is made from injection molded DuPont extreme temperature glass reinforced polymer. It fits all the popular 12 gauge shotguns, Mossberg Maverick 88, Mossberg 500/535/590/835, Remington 870, American Tactical Imports MB3 shotguns, and Winchester 1200/1300 Pump-Shotguns, as well as the majority of other shotguns with a 1 inch mage tube. Lifetime Warranty from ATI.