Kexuan 5/8x24 Competition Grade Muzzle Brake for AR-10 LR .308/7.62 NATO Steel with Black Phosphate Finish. LR 308 5/8inx24 thread. Crush washer and Jam nut included Specifications for Kexuan AR-10 Competition Grade Muzzle Brake: Manufacturer: Kexuan Color: Black Projectile Caliber: .308 Caliber Caliber: 7.62x51mm NATO Finish: Black Phosphate Fabric/Material: Stainless Steel Threads per Inch: 5/8x24 Gun Make: AR Platform Gun Model: DPMS LR-308 AR-10 Features of Kexuan AR-10 Competition Grade Muzzle Brake Reduce the area needed to take up the recoil stroke Redirects propellant gases to counter recoil and unwanted rising Helps to control recoil and rising of barrel after firing Package Contents: Kexuan AR-10 Competition Grade Muzzle Brake Jam nut Crush washer What firearm models does the manufacturer say Kexuan AR-10 Competition Grade Muzzle Brake is compatible with? The manufacturer says that Kexuan AR-10 Competition Grade Muzzle Brake is compatible with AR-10 DPMS LR-308Kexuan MZ-07-02-B: 5/8x24 Competition Grade Muzzle Brake for AR-10 LR .308/7.62 NATO Steel with Black Phosphate Finish