SilencerCo AC22 Fixed Barrel Spacer | Osprey/Octane

The SilencerCo AC22 fixed barrel spacer is a heat-treated 17-4 stainless steel component designed to disable the Nielsen device movement so Osprey and Octane piston kits can be used with fixed-barrel firearms. It replaces the piston booster spring on the Osprey 2.0 and is intended for use with compatible piston assemblies. The spacer provides a robust, corrosion-resistant interface where a booster spring would otherwise allow movement.

Typical applications include installation of Osprey/Octane piston kits on fixed-barrel rifles and submachine-gun platforms, and configuring piston-equipped hosts for range, training, or competition use where a fixed barrel is present.

Product Specifications

• The product is identified as the SilencerCo AC22 Fixed Barrel Spacer for Osprey/Octane systems.
• The material is specified as 17-4 stainless steel and is described as heat treated for durability.
• The primary function is to disable Nielsen device movement so pistons can be used on fixed-barrel firearms.
• The spacer is intended to be used with pistons and replaces the piston booster spring for Osprey 2.0 installations.
• The listed fit is Osprey/Octane.
• The listed finish is Stainless.
• The product type is categorized as a Barrel Spacer and falls under suppressor accessories.
• Compatible host types called out in the source are fixed-barrel rifles and submachine guns.
• The item is described as not designed to be disassembled in the provided attributes.
• The UPC is 817272010121.

This spacer is a straightforward, purpose-built component for users who need to adapt Osprey/Octane piston systems to fixed-barrel hosts. Its 17-4 stainless construction and heat treatment prioritize durability in service applications. If your build uses Osprey/Octane pistons on a fixed-barrel firearm, this spacer provides the specific mechanical interface required for that configuration.