This allows the Flow Range 36 Ti, CA$H 9k and RAD 9/45 to be mounted to a pistol with a tilting or reciprocating barrel. The Booster Assembly simply mounts to the back of your pistol suppressor or HUB Piston Housing Adapter, and then can be threaded directly to your pistol barrel. | Huxwrx 1/2x28 Firearm Piston Booster Assembly