The SilencerCo AC24 Osprey/Octane Piston in .578x28 for 45 ACP stainless steel is designed for quick, tool-free interchange across compatible hosts, featuring 17-4 stainless steel construction thats heat-treated for maximum durability and longevity. These pistons form part of the Nielson device, enabling smooth semi-automatic cycling by reliably unlocking pistol barrels, while SilencerCos female threading securely attaches to SilencerCo threaded barrels for a snug, repeatable fit. For fixed-barrel applications, a Fixed Barrel Spacer can be thrown in to accommodate different configurations, and XL pistons are available when extra length between the threaded barrel and the suppressor is required, ensuring compatibility with a broader range of hosts. This model, aligned with SilencerCos Osprey/Octane line, provides a robust, low-profile solution that preserves performance and reliability across varying shooting setups, making it a versatile choice for shooters seeking dependable piston performance on 45 ACP platforms without compromising cycling consistency or durability.