Kexuan Tactical 5/8inx24 Competition Grade Muzzle Brake for AR-15 Steel with Black Phosphate Finish. Crush washer and Jam nut included. High quality steel construction with Phosphate finish and CNC machined tech Specifications for Kexuan AR-10 .LR 308 Tactical Competition Grade Muzzle Brake: Manufacturer: Kexuan Color: Black Projectile Caliber: .308 Caliber Finish: Black Phosphate Fabric/Material: Stainless Steel Threads per Inch: 5/8x24 Gun Make: AR Platform Gun Model: AR-15 Package Contents: Kexuan AR-10 .LR 308 Tactical Competition Grade Muzzle Brake Jam nut Crush washer What firearm models does the manufacturer say Kexuan AR-10 .LR 308 Tactical Competition Grade Muzzle Brake is compatible with? The manufacturer says that Kexuan AR-10 .LR 308 Tactical Competition Grade Muzzle Brake is compatible with AR-15Kexuan MZ-05-02-B: Tactical 5/8inx24 Competition Grade Muzzle Brake for AR-15 Steel with Black Phosphate Finish