Our Old Testament Firearms HB-Series barrels produced in partnership with Hughes Ballistics are chambered in 5.56 NATO. This 14.7-Inch USGI Profile carbine-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.
This barrel is a perfect length for your standard "Pin and Weld" of a muzzle device to bring the "overall length" to 16 inches to satisfy the alphabet bois (ATF).
Additional Info
Old Testament Firearms
Old Testament Firearms
Old Testament Firearms
Ballistic Advantage
