Transform your SilencerCo pistol suppressor for fixed barrel applications in minutes. This precision-machined spacer replaces the booster spring in your Nielsen device, allowing you to run suppressors such as the Osprey, Octane, Omega K, or Hybrid 46 on pistol caliber carbines, subguns, and other fixed barrel firearms. Nielsen devices (boosters) are designed to allow proper cycling on tilting barrel handguns, but on fixed barrel platforms like PCCs and subguns, that movement is unnecessary and can reduce consistency. This spacer locks the system solid for optimal stability and performance on fixed barrel setups. Product Details Model: AC22 Material: 17-4 stainless steel construction Designed for SilencerCo pistol suppressors using Nielsen devices Compatible suppressors: Osprey, Octane, Omega K, Hybrid 46 Intended use: Fixed barrel firearms (PCCs, subguns, and similar platforms) Product Features Precision-machined fixed barrel spacer Replaces booster spring in Nielsen device assemblies Drop-in installation for quick and easy setup Retains piston and retaining cap during conversion Improves stability and consistency on fixed barrel firearms Helps prevent unnecessary movement and wear Compatible with 10+ suppressor models