The Gemtech GM-45 Piston for MK23 (brand part no. 12190) is a booster piston built for Gemtech’s GM-45 suppressor line on MK23-pattern host pistols, letting the barrel reciprocate independently of the suppressor’s added mass. That independent movement is what keeps a recoil-operated .45-caliber pistol cycling reliably once a can is mounted, rather than short-stroking or failing to lock back. As a wear item, the piston can be replaced on its own as springs and seals age, without buying a new suppressor. It ships as a standalone service part, separate from the suppressor tube.

Key Specifications

• Built as a piston for the GM-45 suppressor line, letting the barrel cycle independently of the suppressor’s mass.
• Fitted specifically for the MK23-pattern host pistol, matching its barrel and mounting geometry.
• An overall length of 5.7 inches covers the full piston assembly.

Frequently Asked Questions

What does this piston do? It lets the barrel reciprocate independently of the suppressor’s mass, which keeps a recoil-operated pistol cycling reliably with a can attached.

What pistol is this piston built for? It’s fitted for MK23-pattern host pistols running Gemtech’s GM-45 suppressor.

Is this a wear item that needs replacing? Yes, pistons are a service part that can wear over time and be replaced independently of the suppressor.

Buy the Gemtech Piston, GM-45 LID for MK23

Order the Gemtech GM-45 Piston for MK23 from our Lubbock, Texas gun shop for fast, direct shipping. See more Class 3 suppressor service parts in our Class 3 parts and accessories category.