The SilencerCo Piston (brand part number AC27) is a .40 S&W piston threaded M14.5×1 LH and built from 17-4 stainless steel, then heat-treated for maximum durability. SilencerCo designed its pistons to be easily changed between host firearms or calibers, since the piston is part of the Nielson device that moves to allow semi-automatic cycling and unlock the pistol barrel under recoil. It uses female threading that attaches to SilencerCo’s own threaded barrels, and it is compatible with the Omega K Series, Hybrid 46, Hybrid 46M with Charlie Piston Mount, Osprey Series, Octane Series, and Omega 36M with Charlie Piston Mount; a Fixed Barrel Spacer can be added for fixed-barrel applications.

Key Specifications

• Threaded M14.5×1 LH.
• Rated for .40 S&W.
• Machined from 17-4 stainless steel, then heat-treated for durability.
• Part of the Nielson device that enables semi-automatic cycling and barrel unlocking.
• Uses female threading to attach to SilencerCo threaded barrels.
• Designed to be easily changed between different host firearms or calibers.
• Compatible with the Omega K Series, Hybrid 46, and Hybrid 46M (with Charlie Piston Mount).
• Compatible with the Osprey Series, Octane Series, and Omega 36M (with Charlie Piston Mount).
• Accepts a Fixed Barrel Spacer for fixed-barrel applications.

Frequently Asked Questions

What suppressor hosts is this piston compatible with? The Omega K Series, Hybrid 46, Hybrid 46M, Osprey Series, Octane Series, and Omega 36M.

What is the piston’s role in the suppressor? It is part of the Nielson device, which moves to allow semi-automatic cycling by unlocking the pistol barrel.

Can this be used on a fixed-barrel host? Yes, with a Fixed Barrel Spacer added.

Buy the SilencerCo Piston, .40 S&W

Match your suppressor to a new host or caliber with a genuine SilencerCo piston. Order it from our Class 3 parts and accessories selection at our Lubbock, Texas gun shop for fast, direct shipping.