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Call or Text (For Fastest Response) 715-271-8361

View This Upper On Our Website - CLICK HERE TO VIEW 12.5" Upper Receiver Group

Old Testament Firearms
 offers this phenomenal 12.5-Inch AR15 Rifle Upper Receiver Group! Built upon a Ballistic Advantage Modern Series Barrel chambered in 5.56 NATO (.223) with carbine gas system for reliable operation suppressed or unsurpressed. It provides exceptional reliability and durability! Our 12" Lightweight Free Float M-LOK Handguard has a shaved top rail for streamlined looks and the ability to index your support hand in the same location every time. Our handguard also offers 7-sides of MLOK attachment of your preferred accessories or rail covers.

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:

  • 12.5" Ballistic Advantage Modern Series AR15 Barrel, Salt Bath Nitride Finish, 1:7 Twist 
  • 12" Free Float OT Firearms M-LOK Lightweight Handguard (1.3" ID, 1.5" OD)
  • OT Firearms Forged 7076-T6 M4 Upper Receiver
  • Nitride Finish Low-Profile Gas Block
  • Nitride Finish Carbine Length Gas Tube
  • A2 Style Compensator For Reduced Muzzle Rise