16" Crown Series Barrel | 1:7 Twist 5R Rifling | Mid-Length Gas | 5.56 NATO

Our Old Testament Firearms HB-Series barrels produced in partnership with Hughes Ballistics are chambered in 5.56 NATO. This 16-Inch USGI Profile mid-length Barrel is machined from 4150 Chrome Moly Vanadium steel with a Black Nitride QPQ Corrosion Resistant Finish and Black Nitride QPQ Corrosion Resistant coated M4 feed ramp extension.

4150 has a 0.50% carbon content and is used for barrels that need to be tougher, have more strength, and higher hardness than 4140 or 4130 can provide. It's a little less common and takes a little extra effort to machine but produces the right results.

Additional Info

• Length 16"
• Material 4150 Chrome Moly Vanadium
• Profile Government
• Finish Black Nitride Corrosion QPQ Resistant
• Gas System Length Mid-length
• Gas Block Journal .750"
• Twist Rate 1:7 inches
• Rifling 5R
• Muzzle 1/2x28 Threaded
• Weight 28oz