16" Super Duty Series 5.56 NATO Barrel - 1:7 Twist | Mid-Length Gas

Old Testament Firearms
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16" Old Testament Firearms DUTY GRADE Barrel 5.56 NATO

  • 1 MOA Guaranteed Barrel
  • Full-Auto Rated
  • 11º Target Crown Muzzle
  • 4150 CMV
  • Mid-Length Gas System
  • 1:7 Twist Rate
  • .750 Gas Block Journal Size
  • .078" Gas Port Size
  • 1/2-28 Threaded Muzzle
  • Blacknitride+ Coated
  • 100% American Made


Our barrels are produced from raw bar stock to finished product with the highest standards.  We drill, ream, rifle, contour and assemble each barrel with our robotic driven production line ensuring exceptional quality and tolerance at each process.  Each barrel is properly stress relieved after rifling, and extensions are torqued after nitride.

Quality control systems ensure that all barrels are dimensionally correct and bores fall within their individual tolerance.  These barrels are the best value on the market!