The SOUTHPAW is Optimized for 5.56/.223 Calibers and has a built in Plan B taper lock (Quickie Fast-Attach) and included in the box is a Q 1/2-28 Rearend Muzzle Device all designed for effortless mounting and detachment. This is Q’s first dedicated 5.56 silencer and has no barrel-length restrictions. The SOUTHPAW with its 6-inch compact design is lightweight (13.2 ounces) while also delivering reduced blowback as well as enhanced suppression. A great can that is easy to handle out of the box for any enthusiast.