The SMC1100 clamp by Advanced Technology International (ATI) amplifies the bond between the magazine extension and the barrel. This versatile tool can also be utilized to affix a light or laser with a diameter of 1\" to the barrel.Its design comes with an included sling swivel stud, which can be reversed to cater to both right and left-handed shooters. Manufactured using an extreme temperature, glass-reinforced polymer, the SMC1100 clamp is durable and resilient.It is highly compatible and fits all varieties of 12-gauge shotguns.