The SilencerCo XL Piston, M13.5×1 LH (SilencerCo part no. AC626) is the part of the Nielsen device that moves and allows semi-automatic cycling on pistol barrels that unlock during firing. SilencerCo designed its pistons to be changed easily for different host firearms, and the female threads on the piston attach to the threaded muzzle of the host. This one is cut for M13.5×1 LH threads and is made from heat-treated 17-4 stainless steel. The XL length is for firearms where the suppressor needs extra distance between the threaded barrel and the suppressor.

Key Specifications

• Thread pitch is M13.5×1 LH, the female thread that attaches to the muzzle of the host pistol.
• This is the XL length, which adds distance between the threaded barrel and the suppressor.
• Construction is 17-4 stainless steel, a strong alloy for a part that moves with every shot.
• The piston is heat treated for maximum durability.
• Its job is to be the moving part of the Nielsen device, allowing semi-automatic cycling on pistols whose barrels unlock during firing.
• Compatible suppressors include the Osprey, Octane and Spectre series, Hybrid 46, Hybrid 46M and Omega 36M.
• The Hybrid 46 needs a Bravo Piston Mount, and the Omega 36M and Hybrid 46M need a Charlie Piston Mount, sold separately.
• For a fixed-barrel firearm, use a Fixed Barrel Spacer instead of a piston.

Frequently Asked Questions

What thread pitch is this SilencerCo piston? This is the M13.5×1 LH piston. SilencerCo sells other thread pitches as separate items, so match the piston to your barrel.

Which suppressors use a SilencerCo piston? The Osprey, Octane and Spectre series, the Hybrid 46, Hybrid 46M and Omega 36M. The Hybrid 46 requires a Bravo Piston Mount, and the Omega 36M and Hybrid 46M require a Charlie Piston Mount.

Can I use it on a fixed-barrel firearm? No. A fixed-barrel firearm should use a Fixed Barrel Spacer instead of a piston.

Buy the SilencerCo XL Pistol Suppressor Piston, M13.5×1 LH

Choosing a piston is a matter of matching the thread on your pistol barrel, and this one covers the M13.5×1 LH pitch. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see more suppressor parts and accessories from SilencerCo while you are there.