Kexuan Steel Competition Grade Muzzle Brake Recoil Compensator for AR-15 .223 1/2inx28 thread Gunmetal Black. 223 5/8inx24 thread. Crush washer and Jam nut included. Specifications for Kexuan AR-10 / AR-15 Steel Competition Grade Muzzle Brake Recoil Compensator: Manufacturer: Kexuan Color: Black Fabric/Material: Stainless Steel Gun Make: AR Platform Features of Kexuan AR-10 / AR-15 Steel 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 High quality steel construction with CNC machined tech Package Contents: Kexuan AR-10 / AR-15 Steel Competition Grade Muzzle Brake Recoil Compensator Jam nut Crush washer What firearm models does the manufacturer say Kexuan AR-10 / AR-15 Steel Competition Grade Muzzle Brake Recoil Compensator is compatible with? The manufacturer says that Kexuan AR-10 / AR-15 Steel Competition Grade Muzzle Brake Recoil Compensator is compatible with AR-10 DPMS LR-308 AR-15Kexuan MZ-09-01-B: Steel Competition Grade Muzzle Brake Recoil Compensator for AR-15 .223 1/2inx28 thread Gunmetal Black