Kexuan 1/2x28 Muzzle Brake for AR-15 .223/5.56 NATO Black Steel. Black steel muzzle brake/recoil compensator. Jam nut included. High quality Steel construction with CNC machined tech Specifications for Kexuan AR-10 / AR-15 Muzzle Brake: Manufacturer: Kexuan Color: Black Fabric/Material: Stainless Steel Gun Make: AR Platform Package Contents: Kexuan AR-10 / AR-15 Muzzle Brake Jam nut Crush washer What firearm models does the manufacturer say Kexuan AR-10 / AR-15 Muzzle Brake is compatible with? The manufacturer suggests that Kexuan AR-10 / AR-15 Muzzle Brake is compatible with AR-15 AR-10 DPMS LR-308Kexuan MZ-06S-01-B: 1/2x28 Muzzle Brake for AR-15 .223/5.56 NATO Black Steel