Product Description The SilencerCo Piston (9/16x24) is designed for quick, easy replacement to match different host firearms or calibers when using compatible SilencerCo pistol suppressor systems. Manufactured from durable 17-4 stainless steel and heat treated for long service life, this piston is part of the Nielsen device assembly that helps enable reliable semi-automatic cycling by allowing the suppressor to move and unlock pistol barrels. It features female threading to mate with SilencerCo threaded barrels, and for fixed-barrel setups SilencerCo recommends pairing it with a Fixed Barrel Spacer. Product Highlights 9/16x24 female-thread suppressor piston for compatible SilencerCo pistol suppressor mounts Built from 17-4 stainless steel and heat treated for maximum durability Integral component of the Nielsen device to help support semi-auto cycling and barrel unlocking Compatible with Omega K Series, Hybrid 46, Osprey Series, and Octane Series Compatible with Hybrid 46M and Omega 36M when used with a Charlie Piston Mount Specs Brand: SilencerCo Manufacturer Part Number: AC31 UPC: 817272010213 Product Type: Suppressor piston Thread Pitch: 9/16x24 (female) Material: 17-4 stainless steel Heat Treatment: Heat treated Compatibility: Omega K Series, Hybrid 46, Osprey Series, Octane Series Additional Compatibility: Hybrid 46M and Omega 36M with Charlie Piston Mount Application: .40 S&W handguns (9/16-24) Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.