16" OT Firearms GENESIS Billet Upper Receiver Group - 5.56 NATO (.223)

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The Old Testament Firearms 16-Inch GENESIS BILLET 5.56 NATO Upper Receiver Group offers exceptional quality at a fantastic price which makes this upper receiver one of the nicest looking, nicest shooting and just all around the best value in uppers!

Built on our Billet Upper Receiver with our Minimalist Ejection Port Cover and matching Forward Assist to provide clean lines and exceptional functionality. It is chambered in 5.56 NATO (.223) sporting a lightweight barrel profile and mid-length gas system for silky smooth and soft recoil. It provides exceptional reliability and durability! Regardless of how much you shoot, you should never have to worry about your firearm functioning properly and with our OTF Upper Receiver Group - You won't have to. Our 13" Gen 2 OTF Free Float Handguard locks up rock solid with anti-rotation tabs and provides M-LOK slots for mounting of your weapon lights, foregrip or grip panels.

It is built with quality, made in the U.S.A. components to provide reliable function even after thousands of rounds! We don't strive to sell the lowest price upper receiver groups, but we do aim to provide the best value for the money without sacrificing any quality or reliability.


This 5.56 Upper Receiver Group consists of the following components:

  • 16" OT Firearms 41v50 Lightweigh Profile AR15 Barrel - 5.56 NATO, Mid-Length Gas 1/7 Twist 
  • 13" Free Float OT Firearms M-LOK Gen 2 Handguard
  • OT Firearms Billet 7076-T6 M4 Upper Receiver
  • OT Firearms Nitride Bolt Carrier Group with our lifetime warranty
  • Nitride Finish Low-Profile Gas Block
  • Nitride Finish Mid-Length Gas Tube
  • OT Firearms Ambi Charging Handle w/Gas Buster Lip
  • A2 Flash Hider


Concerned about quality? Don't Be! Old Testament Firearms stands behind their products! All Complete AR15 / LR308 Assemblies and Firearms come with a LIFETIME WARRANTY against manufacturing defects and workmanship! Our components are meant to be put to work!