The Barrel / Magazine Clamp by TacStar stabilizes the Magazine Extension by clamping it to the barrel. The QD Swivel attaches to the swivel base for sling attachment. Both sold separately. Order your Barrel / Magazine Clamp today to improve the stability of your magazine extension on your shotgun. - M1M2 Rem 1100/11-87 & Moss 500/600
Determined at checkout.