Silencer Co Piston M13.5x1LH | 9mm | AC26

The Silencer Co Piston M13.5x1LH is a replacement piston intended for use with the Osprey and Octane family of suppressors. It provides female left-hand M13.5×1 threads to interface with compatible pistol barrels and is built to be interchangeable for different host firearms or subcaliber setups. Constructed from 17-4 stainless steel and heat-treated for durability, the piston serves as the threaded interface and a moving element of the Nielsen-style recoil system used to enable semi-automatic cycling.

Product Specifications

• The manufacturer is Silencer Co.
• The product type is Silencer Piston.
• The listed model/fit is Osprey/Octane.
• The caliber designation is 9mm.
• The thread pattern is M13.5×1 LH.
• The material is specified as 17-4 stainless steel.
• The finish is listed as Stainless.
• The piston is part of the Nielsen-style recoil device and contains female threads that attach to Silencer Co threaded barrels.
• The series is listed as Piston 13.5M x 1LH.
• The NFA thread pattern entry is 13.5x1mm LH.
• Compatibility notes list Sig, HK, Walther, and Glock factory thread barrel fitments per the product attributes.
• The UPC is 817272010169.
• The listing includes a weight value of 0.1 (unit not specified in source data).
• Package dimensions are listed as 6.5 x 4.7 x 1.0 (units not specified in source data).

This piston provides a direct and serviceable threaded interface for Osprey/Octane owners who need interchangeability across hosts or a durable replacement part for range and training use. Its stainless construction and heat treatment favor longevity and consistent operation while allowing quick changes to fit different pistol platforms or subcaliber configurations.