Complete 4.5" 9MM Pistol Upper Receiver - Black | FLASH CAN | 5.5" M-LOK Slant Cut | With BCG & CH

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Product Code: RTB459MM55-C
MSRP: $329.99
Sale Price: Sale Price: $309.95
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Complete 4.5" 9MM Pistol Upper Receiver | FLASH CAN | 5.5" M-LOK Slant Cut | With Bolt Carrier Group and Charging Handle

This Complete 4.5 inch M-LOK upper receiver comes with a 5.5 inch free float handguard and is built with only the best Mil-Spec components. The heart of this upper is comprised of a 4150 black nitride 9mm barrel and our black nitride bolt carrier group that is finished with incredible polish, making the action smooth and easy to keep clean.

Caliber 9mm
Length 4.5
Material 4150 Chrome Moly Vanadium
Profile Straight
Finish QPQ Corrosion Resistant
Gas System Length None
Gas Block Journal N/A
Dimpled? No
Twist Rate 1:10
Muzzle Thread 1/2x36 TPI
Weight 8.3oz
Barrel Extension Integrated
Target Crown 11 Degree


Bolt Carrier Group:

  • Colt & Glock Compatible
  • USA made 8620 Steel Carrier Construction
  • Phosphated or Nitrided Finish
  • Heavy Firing Pin Retaining Spring
  • 14.8 oz.

Upper Receiver:

  • Machined from a Mil-Spec 7075 T6 Forging
  • Black Anodization


  • 5.5" free-float handguard
  • MIL-STD 1913 Picatinny rail on top
  • 2 M-Lok slots on 3 sides
  • Precision Machined aicraft grade aluminum, for high strength and weight savings
  • Clamp-on system for easy assembly
  • Steel Barrel nut to resist movement under heat
  • Made in the USA

Charging Handle:

  • Forged 7075 Aluminum construction
  • Mil-Spec Type-III Hardcoat Anodized 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.***