Match-quality barrel feature Nitromet salt bath nitride to give maximum wear resistance and durability. Barrel has a Nitromet nitrided bore treatment for longer life than chrome without affecting accuracy. Barrels are made of 4150 CrMoV, chambered for 9mm, button rifled with 1-10 twist rifling, and machined to a standard government exterior profile. 1/2-28 threads on the muzzle end.\n\nSpecifications:\n- Caliber: 9mm Luger\n- Twist Rate: 1-10\n- Barrel Material: 4150 Chrome Moly Vanadium\n- Gun Make: AR Platform\n- Weight: 14 oz\n- Condition: New\n- Gas System Type: Blowback\n- Gun Type: Rifle\n- Projectile Caliber: .355 Caliber\n\nPackage Contents:\n- WMD Guns 9mm 1:10 Twist Nitromet Barrel