20" 5.56 1/8 Twist Heavy Barrel
20" 5.56 1/8 Twist Heavy Barrel, The 20" 5.56 NATO barrel has a military A2 HBAR profile. The barrel has a 1/8 twist. The barrel extension is pre-installed and headspaced. Specs Caliber: 5.56 NATO | .223 Length: 20" Diameter at the gas port: .750" Barrel Threading: 1/2x28 Twist Rate: 1/8 Barrel Profile: A2 Heavy Barrel (HBAR) Barrel Material: 4140 CMV Barrel Lining: Chrome Lined Barrel Coating: Manganese phosphate Gas System: Rifle Length Direct Impingement SKU: STAG400076 FAQ Q: Will this work with my upper receiver? A: The barrel will work with any mil-spec upper receiver. Q: Do you provide instructions on how to install the barrel? A: Unfortunately we don't provide directions on how to install a barrel and recommend that it be installed by a gunsmith to prevent damage to the rifle. Q: Do I have to purchase a matched bolt to my barrel? A: With AR-15's as long as you are using the proper bolt for the caliber you do not need to match a bolt to the barrel.