Description The Advanced Technology / ATI SMC1100 shotgun mag clamp is a compact, multi-function clamp designed for 12-gauge shotguns. It strengthens the connection between a magazine extension and the barrel while offering a 1″ diameter mounting point for a light or laser. A reversible sling swivel stud is included to accommodate right- or left-handed shooters. The clamp is molded from DuPont extreme-temperature, glass-reinforced polymer (glass-filled nylon) and carries a black matte finish. Key Specifications The clamp fits all 12-gauge shotguns. The construction uses DuPont extreme-temperature, glass-reinforced polymer. Includes a reversible sling swivel stud for right- or left-handed shooters. Provides a mounting point for a 1-inch diameter light or laser. The finish is black matte. Manufactured in the USA. Dimensions are listed as 1.75 x 5.50 x 8.85 inches. The clamp serves three functions: strengthen mag extension, mount a 1″ light/laser, and provide a reversible sling swivel stud. Classified as a part / handguard accessory. Durable and purpose-built, the SMC1100 offers a straightforward way to add a mounting point and reinforce a magazine extension without permanent modification. Its glass-filled polymer construction keeps weight low while providing temperature and impact resistance, and the reversible swivel stud adds practical carry options. For shooters seeking a minimal, functional accessory to support accessory mounting and magazine-extension stability, this clamp provides a focused, reliable solution.