Kexuan Competition Grade Muzzle Brake Recoil Compensator for AR-10 LR 308 5/8inx24 thread Steel with Black Knurled Phosphate finish. Crush washer and Jam nut included. Specifications for Kexuan AR-10 / AR-15 Competition Grade Muzzle Brake Recoil Compensator: Manufacturer: Kexuan Color: Black Finish: Black Knurled Phosphate Fabric/Material: Stainless Steel Gun Make: AR Platform Condition: New Features of Kexuan AR-10 / AR-15 Competition Grade Muzzle Brake Recoil Compensator Helps to control recoil and rising of barrel after firing Redirects propellant gases to counter recoil and unwanted rising Reduce the area needed to take up the recoil stroke Package Contents: Kexuan AR-10 / AR-15 Competition Grade Muzzle Brake Recoil Compensator Jam nut Crush washer What firearm models does the manufacturer say Kexuan AR-10 / AR-15 Competition Grade Muzzle Brake Recoil Compensator is compatible with? The manufacturer suggests that Kexuan AR-10 / AR-15 Competition Grade Muzzle Brake Recoil Compensator is compatible with AR-15 AR-10 DPMS LR-308Kexuan MZ-08-02-B: Competition Grade Muzzle Brake Recoil Compensator for AR-10 LR 308 5/8inx24 thread Steel with Black Knurled Phosphate finish