BYO 16" 5.56 Upper Receiver - Assembly Available

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Product Code: RTB16-MTO
Our Price: $339.95
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BUILD YOUR OWN - 16" 5.56 Upper Receiver - Assembly Available

If you want to upgrade any of the traditional Mil-Spec components to get a custom look, please use the menues on the side. Assembly and Test Firing also available if you want to be able to use it out of the box. 

This 16 inch M-LOK upper receiver comes with a 15 inch free float handguard and is built with only the best Mil-Spec components. The heart of this upper is comprised of a 4150 M4 barrel and our black nitride bolt carrier group that is finished with an incredible polish, making the action smooth and easy to keep clean.


  • 16" 5.56 4150 CMV Barrel - Parkerized
  • M4 Carbine Profile - .750" GB Journal
  • 1:7 Twist Rate - 1/2x28 Muzzle Thread
  • Fitted with A2 Flash Hider

Upper Receiver:

  • Machined from a Mil-Spec 7075 T6 Forging
  • Hard Coat Anodized per Mil-A-8625F, Type III
  • M4 Feed ramps


  • 15" Lightweight - Free Float M-LOK