JK Armament JK155 Piston .578x28 .45 Cal Black Nitride Stainless Steel

The JK Armament JK155 Piston is a precision-machined booster piston built for .45 caliber semi-automatic centerfire pistols. It threads directly onto the pistol barrel using a .578x28 pattern and cycles JK 155 series suppressors reliably on locked-breech handguns chambered in .45 ACP or 10mm Auto.

Constructed from stainless steel and finished in black nitride, the JK155 piston is engineered for corrosion resistance and smooth, low-friction operation over high round counts. The piston uses JK Armament's HUB booster interface, so it is also a drop-in fit for many other pistol suppressors that accept a standard booster assembly.

Whether you run a JK 155 PCX, a JK 155 VERSAX, or another HUB-mount pistol suppressor, the JK155 piston is a practical spare or replacement that keeps your .45-caliber or 10mm suppressor host running.