Complete 16" 5.56 Carbine Upper Receiver - Black | 15" M-LOK | With BCG & CH

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Product Code: RTB16C55612RA2
MSRP: $529.95
Sale Price: Sale Price: $366.95
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Complete 16" 5.56 Carbine Upper Receiver | 15" M-LOK Rail | With Bolt Carrier Group and Charging Handle

This Complete 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.

We also carry this Upper Receiver unassembled here if you are a DIYer / Do It Yourselfer.

Caliber 5.56
Length 16"
Material 4150 Chrome Moly Vanadium
Profile M4
Finish QPQ Corrosion Resistant
Gas System Length Carbine
Gas Block Journal .750"
Dimpled? No
Twist Rate 1:7
Muzzle Thread 1/2x28 TPI
Weight 27.2oz
Barrel Extension M4 Feed Ramps
Target Crown 11 Degree


Bolt Carrier Group:

  • Enhanced 9310 Steel (Bolt)
  • 8620 Tool Steel (Carrier)
  • Bolt is shot Peened and MPI
  • All BCG components pre polished before being processed and then post polished for an incredible shine

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

Charging Handle:

  • Forged 7075 Aluminum construction
  • Mil-Spec Type-III Hardcoat Anodized finish
Please Note: These Uppers are designed to work flawlessly with quality full powered 5.56 ammo. Underpowered steel cased ammo will likely work but is not guaranteed. Every upper is test fired with 5.56 NATO – 55 Grain quality ammunition.

***Please allow an additional 2-3 business days of lead time as these uppers are made to order.***