BG Complete 16" 5.56 Upper Receiver | A2 | 12" AA Octo M-LOK | With BCG & CH

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Product Code: BG1655612OCT-BLK
List Price: $439.95
MSRP: $439.95
Sale Price: Sale Price: $226.95
Savings: $213.00
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Builder's Grade Complete 16" 5.56 Carbine Upper Receiver | 12" Always Armed Octo Series M-LOK | BCG & CH

This Complete 16 inch M-LOK upper receiver comes with the Always Armed 12 inch free float Octo Series handguard and is built with only the best Mil-Spec components. The heart of this upper is comprised of a 4150 barrel and our black nitride bolt carrier group that is finished with an incredible polish, making the action smooth and easy to keep clean.

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 are 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
  • Made in the U.S.A.


  • Free Float 12" M-Lok Hand Guard
  • MIL-STD 1913 Picatinny Rail
  • M-Lok Slots on 4 Sides
  • 6000 Series Aluminum Extrusion
  • Clamp on System for Easy Assembly
  • Steel Barrel Nut & Mounting Screws Included
  • Hard Coat Black Anodized Finish
  • Made in the USA
  • Lightweight Design
  • Weight: 13.5oz


Charging Handle:

  • Alloy Charging Handle Assembly
  • Complete with Standard Latch
  • Made from hardcoat anodized aluminum
  • Black finish

Please Note: Uppers may present light fouling from our quality control process and/or test firing

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