BG 6" 300 BLK Upper Receiver - Black | A2 | 5.5" Slant Cut M-LOK | Without BCG & CH

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Product Code: BGBU-630055SA2-BLK
MSRP: $366.95
Sale Price: Sale Price: $151.95
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Builder's Grade 6" 300 BLK Upper Receiver | A2 | 5.5" Slant Cut M-LOK - Black Anodized

This 6 inch M-LOK upper receiver comes with a 5.5 inch free float handguard that has a slant cut design and is built with only the best Mil-Spec components. The heart of this upper is comprised of a precision 4150 Chrome Moly Vanadium barrel.

Caliber 300BLK
Length 6"
Material 4150 Chrome Moly Vanadium
Profile Medium
Finish QPQ Corrosion Resistant
Gas System Length Pistol
Gas Block Journal .750"
Dimpled? Yes
Twist Rate 1:7
Muzzle Thread 5/8x24 TPI
Weight 14oz
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.


  • 5.5" free float handguard
  • MIL-STD 1913 Picatinny rail on top
  • 2 M-Lok slots on 3 sides
  • Precision Machined aircraft grade aluminum, for high strength and weight savings
  • Hard Coat Anodized per Mil-A-8625F, Type III, Class 2
  • Clamp on system for easy assembly
  • Steel Barrel nut to resist movement under heat
  • 8.8 oz with barrel nut and hardware
  • 1.35" Inside Diameter
  • 1.65" Wide
  • Made in USA

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.***

All NFA/ATF Rules Apply

Depending on your state and local laws, you could use this barrel with a lower receiver that is a Registered SBR, or Pistol. Possession of this barrel along with a Non-NFA lower receiver may be Prohibited. We are not lawyers and the above information is not legal advise. Make sure you understand the most up to date federal, state and local laws before proceeding with this product.