10.5" Crown Series Barrel | 1:7 Twist 5R Rifling | Carbine Length Gas | 5.56 NATO

Old Testament Firearms
$140.00 $137.99
Current Stock:
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Our Old Testament Firearms HB-Series barrels produced in partnership with Hughes Ballistics are chambered in 5.56 NATO. This 10.5-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 has an overall length less than 16-inches which means all NFA RULES APPLY.

Additional Info

  • Length 10.5"
  • Material 4150 Chrome Moly Vanadium
  • Profile Government
  • Finish Black Nitride Corrosion Resistant
  • Gas System Length Carbine
  • Gas Block Journal .750"
  • Twist Rate 1:7 inches
  • Rifling 5R
  • Muzzle 1/2x28 Threaded
  • Weight 20.4oz

All NFA/ATF Rules Apply
You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm.