Black Aces Tactical Mossberg 930 Tactical Rail This one-piece aluminum rail chassis will turn your shotgun into an advanced weapons platform. The full length Picatinny rail provides plenty of room for mounting accessories, optics, bipods, lights, lasers, vertical grips, and even less-lethal launchers. The low-profile top rail has plenty of room for back-up iron sights co-witnessed with your primary optic. Machined from 6061-T6 High strength aircraft aluminum, with weight-reducing cuts that enhance barrel cooling, without sacrificing strength and rigidity. The Black Aces Tactical quad rail system features: Fits Mossberg 930 One piece T6 6061 construction Light 15 ounce weight!! Type 2 black anodizing Full install kit with tools is included. No gunsmithing required! This rail will fit both tapped and untapped receivers. Install time take under 10 minutes from the time the rail is removed from the box to the time the shotgun is ready to fire. Tools are supplied as well as instructions! Accessories pictured in the first image are optional separate purchases. - Extension tubes with sling loops may hinder the rail. - Barrels with breacher muzzles or compensated muzzles will not work with this rail chassis system. The chassis clamps are made for a straight standard diameter barrel. When you add a breacher on the barrel the clamp may not fit snuggly. The whole design of the barrel keeps all the shock from your shots on that clamp. If it does not fit snug then the shock will transfer to the pins in the back of the gun. This will allow the rail to move around and eventually can break. - OEM or aftermarket heat shields will have to be removed as the chassis is designed to act as a heat shield.