BG 16" 5.56 Upper Receiver | A2 | 12" AA Octo M-LOK | Without BCG & CH

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Product Code: BGBU-1655612OCT-BLK
List Price: $384.95
MSRP: $384.95
Sale Price: Sale Price: $161.95
Savings: $223.00
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Builder's Grade Complete 16" 5.56 Carbine Upper Receiver | 12" Always Armed Octo Series M-LOK | Without Bolt Carrier Group and Charging Handle


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Click here for Bolt Carrier Groups

This Barreled 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.

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

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

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.***