Quickly add a laser sight to your weapon, no receiver rail needed!  This item works with most barrels.  Simply clamp the mount to your barrel.  The integrated laser sight features a convenient side on/off switch for easy operation.  The side and top rails are standard picatinny width which means they will accept any picatinny (weaver) compatible accessory.  A great way to maintain a clean hand guard and still add a laser and accesory rail space.