Q Southpaw. Dedicated 5.56/.223 silencer with built-in Plan B taper lock (Quickie Fast-Attach). 6" compact design at just 13.2 oz. Delivers reduced blowback and enhanced suppression with no barrel-length restrictions. Includes Q 1/2-28 Rearend muzzle device. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor