Standard shotgun cap replaces factory cap and allows the use of GT Push Button swivels, GT Twist Lock swivels or even the GT Multi-Adaptor for speed and versatility in the field. Set includes 12 gauge mag cap and standard 1 inch GT Push Button Swivel.Standard mag cap replaces factory cap and allows the use of any GrovTec push button swivel or even the multi-adaptor for speed and versatility in the field. Each set includes one 12 gauge mag cap and one standard 1 inches loop push button swivel.