The JK HUB Piston Mount delivers reliable operation of JK 155 suppressors (plus other brands’ pistol suppressors) on semi-automatic, centerfire pistols. It installs in place of your JK 155 suppressor’s taper mount or other mount accessory, threading directly into the base of the serialized suppressor tube with its HUB-standard 1-3/8×24 (1.375×24) thread pitch.