Shop › ADV TECH MAG CLAMP W/SWIVEL STUD 12G ADV TECH MAG CLAMP W/SWIVEL STUD 12G $10.49 ATI Outdoors Magazine Clamp, Fits 12 Gauge Shotguns, with Sling Swivel, Black SMC1100 Quantity: Add To Cart Added! ATI Outdoors Magazine Clamp, Fits 12 Gauge Shotguns, with Sling Swivel, Black SMC1100