The Mesa Tactical magazine tube clamp provides a mounting point for picatinny rails, weapon lights, and sling attachment points near the muzzle of your shotgun. Constructed of durable 6061-T6 aluminum and finished in matte black with type 3 hardcoat anodizing. The threaded portions of the clamp feature HeliCoil steel thread inserts for long thread life. The clamp helps to securely hold factory or aftermarket magazine tube extensions. A 2? picatinny rail section is included with the clamp. The magazine tube clamp will accept the sling mounts and accessories