The Kaw Valley Precision Muzzle Brake is seamlessly engineered to be fully compatible with ASR (Active Spring Retention) mounting systems. Designed to effortlessly attach and detach from your firearm, our brake ensures quick and hassle-free adjustments to your shooting setup without the need for timing or shims. Product Features 17-4 Stainless Steel Material Black Nitride QPQ Finish Product Specifications Weight: 3.1 oz OAL: 2.05" Bore: .500 (ANY Caliber)