OT Firearms 16" Complete Upper with 15" MLOK Handguard - 300 Blackout

Old Testament Firearms
$495.00 $399.99
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Old Testament Firearms offers this phenomenal 16.0-Inch AR15 Rifle Upper Receiver Group chambered in 300 Blackout with pistol gas system for reliable operation suppressed or unsurpressed. 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 Free Float M-LOK Handguard is 15" in length to allow attachment of your preferred suppressor mount. Our handguard locks up solid with anti-rotation tabs and offers M-LOK slots for mounting of your weapon lights, foregrip or grip panels.

All of our uppers are assembled with ONLY 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 300 Blackout Upper Receiver Group consists of the following components:

  • 16" Nitride Finished 300 Blackout Barrel - Medium Profile - Pistol Length Gas System - 1/8 Twist
  • 15" Free Float OT Firearms M-LOK Handguard
  • OT Firearms Forged 7076-T6 M4 Upper Receiver
  • Nitride Finish Low-Profile Gas Block
  • Nitride Finish Pistol Length Gas Tube
  • DOES NOT INCLUDE Bolt Carrier Group / Charging Handle


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!