JK Armament 155 HUB Piston Mount 9mm Luger 1/2x28 Black Nitride Stainless Steel

The JK Armament 155 HUB Piston Mount is a purpose-built booster assembly that lets 9mm Luger semi-automatic pistols run a JK 155 series suppressor (or any other HUB-pattern pistol suppressor) with reliable, repeatable cycling. The spring-loaded piston threads directly onto a pistol barrel threaded 1/2x28, providing the mass and travel needed to unlock the breech as the slide cycles and keep the action running smoothly without the sluggish lockup common to fixed-barrel pistol setups.

Precision-machined from stainless steel and finished in a rugged, corrosion-resistant black nitride coating, this booster is built to handle the heat, fouling, and pressure of repeated suppressed fire. The HUB (Universal Hub) interface is the industry-standard booster pattern, making this piston a versatile drop-in for a wide range of pistol suppressors, not just the JK 155 line.

Rated for 9mm Luger (9x19 Parabellum) semi-auto centerfire pistols, the JK 155 HUB Piston is a simple, dependable upgrade for anyone running a pistol can.