M16 INTERBAR MODEL: IPS/MM12 The IPS/MM12 is an INTERBAR system designed for Colt 723, M4, and 9mm SMG. The IPS bar is drilled to direct mount a 12 gauge shotgun via four mounting screws. Positive lock up on rifle bayonet lug and rifle front hinge pin. Includes INTERBAR, special bottom receiver hinge pin and mounting hardware. Machined from aircraft grade aluminum Allows for quick deployment Rugged construction Hard anodized Made in the U.S.A.