Product Description The SilencerCo Active Spring Retention (ASR) 3-port muzzle brake is designed to reduce felt recoil and muzzle climb while providing fast, secure compatibility with SilencerCo ASR mounting systems. Built for .30 caliber use with 1/2x28 threads, it offers quick one-hand-on/one-hand-off attachment and detachment for suppressor use across a wide range of ASR-compatible SilencerCo suppressors. This muzzle brake includes a shim set and Rocksett for straightforward installation and timing. Product Highlights ASR-compatible muzzle brake for quick, secure suppressor mounting and removal 3-port design helps reduce recoil and muzzle rise for improved control Includes shim set and Rocksett for easier installation and proper timing 1/2x28 thread pattern for .30 caliber / 7.62mm applications Compatible with Specwar, Saker, Omega, Hybrid, and Harvester 338 ASR mounting systems Specs Brand: SilencerCo Manufacturer Part Number: AC1282 UPC: 817272014860 Product Type: Muzzle Brake Mount System: ASR (Active Spring Retention) Caliber: .30 Cal / 7.62mm Thread Pattern: 1/2x28 Port Count: 3-Port Color: Black Material: Steel Included: Shim set, Rocksett Suppressor Compatibility (ASR): Specwar, Saker, Omega, Hybrid, Harvester 338 Model Fit: AR Style 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.