SilencerCo Piston | 1/2×36 Thread | AC57

The SilencerCo piston provides a field-serviceable threaded interface for the Osprey and Octane family of SilencerCo suppressors. It is constructed from 17-4 stainless steel and heat-treated for durability, and it contains the female threads that attach to the host firearm muzzle. The piston is part of the Nielsen device that moves to allow semi-automatic cycling on compatible pistols and can be swapped for subcaliber or fixed-barrel applications.

Product Specifications

• The piston uses 17-4 stainless steel construction and is heat-treated for long-term durability.
• The threaded interface is specified as 1/2×36 TPI female threads.
• The unit is designed to fit Osprey/Octane series suppressors.
• This piston is compatible with Omega K Series, Hybrid 46, Hybrid 46M (with Charlie Piston Mount), Osprey Series, Octane Series, and Omega 36M (with Charlie Piston Mount).
• The piston functions as part of the Nielsen device to allow semi-automatic cycling on compatible host pistols.
• Use a Fixed Barrel Spacer for fixed-barrel applications when required.
• The listed caliber/gauge on the product record is 9mm.
• The product record lists an approximate weight of 0.1 (value as provided).
• The item is described as not drilled and tapped in the provided attributes.
• An additional feature indicates threading compatibility for Colt, RRA, Bushmaster (as provided).
• The NFA thread pattern is recorded as 1/2×36.
• The product is intended to be easily interchangeable to support different host firearms and subcaliber use.
• The manufacturer references this piston by designation in product listings as AC57.
• The UPC for this item is 817272010220.

Compact and purpose-built, this piston gives owners of compatible SilencerCo suppressors an easy way to adapt their muzzle interface for different firearms and calibers. Its heat-treated 17-4 stainless construction and simple swap-out design support routine range maintenance and multi-caliber training or competition use, offering a practical solution for shooters who need modular compatibility.