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.


  • Barrel Material: 4150 CMV Steel
  • Barrel Caliber: 9MM (9x19mm)
  • Barrel Twist: 1:10
  • Barrel Length: 4.5”
  • Finish: Black QPQ Salt Bath Nitride
  • Muzzle Thread: 1/2x36" TPI (Threads Per Inch)
  • 11-degree Target Crown

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.***