Silencer Co Piston 1/2×28 | Osprey/Octane | AC25

This Silencer Co piston is a service component for the Osprey and Octane suppressor families. It is constructed from heat-treated 17-4 stainless steel and features female 1/2×28 tpi threading for use with threaded 9mm host barrels. The piston is the threaded element of the Nielsen device and facilitates semi-automatic cycling on compatible pistols. Swapping pistons lets a single Silencer Co suppressor interface with different host barrels or subcaliber setups.

Product Specifications

• The thread pattern is 1/2×28 tpi.
• The piston material is 17-4 stainless steel.
• The finish is listed as Stainless.
• The listed caliber/size is 9mm.
• The piston is designed to fit Osprey/Octane suppressor models.
• The product line or reference is AC25 / Piston .5×28.
• The component contains female threading to attach to threaded barrels.
• The piston is part of the Nielsen device and enables semi-automatic cycling on compatible hosts.
• The unit weight is listed as 0.10 oz.
• Can be disassembled: No.
• Compatible with Omega K Series, Hybrid 46, Hybrid 46M, Osprey Series, Octane Series, and Omega 36M.
• The product dimensions are listed as Height 1, Length 2.1, Width 1 (units as provided by manufacturer).
• The material is specified as Stainless Steel.
• The thread type is also referenced as .5×28.
• UPC: 817272010152.

This piston is a straightforward replacement part for owners of Silencer Co Osprey and Octane suppressors who need a durable, heat-treated stainless-steel interface for threaded 9mm barrels. Its female thread and Nielsen-device design preserve the suppressor’s semi-automatic cycling functionality while allowing quick swaps to adapt a single suppressor across multiple host barrels or subcaliber setups, making it useful for range and competition applications.