Blackwater was the most feared private military contractor firm for many years and this silencer is a licensed product.  Lightweight aluminum construction with an adapter that allows you to screw this onto any airsoft gun with either a 14mm counterclockwise (CCW) or clockwise (CW) threaded outer barrel.   Most manufacturers make threaded barrels that are 14mm counterclockwise, but G&P and SYSTEMA use clockwise thread.  No matter what, you'll be able to fit this silencer on to any gun with a 14mm thread.