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" 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.