Complete 6" 300 BLK Pistol Upper Receiver - Black | FLASH CAN | 7.25" M-LOK | With BCG & CH

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Product Code: RTB6S300725RFC
Stock Status Stock Status: Out of Stock
MSRP: $499.95
Sale Price: Sale Price: $374.95
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Complete 6" 300 BLK Pistol Upper Receiver | FLASH CAN | 7.25" M-LOK | With Bolt Carrier Group and Charging Handle

This Complete 6" inch M-LOK upper receiver comes with a 7.25" inch free float 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 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


Bolt Carrier Group:

  • Enhanced 9310 Steel (Bolt)
  • 8620 Tool Steel (Carrier)
  • Bolt is shot Peened and MPI
  • All BCG components 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
  • Feed ramps


  • 7.25" Lightweight - Free Float M-LOK

Charging Handle:

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

Please Note: Every upper is test fired during our quality control process and may present light fouling

Please note: These uppers SHOULD cycle most supersonic ammunition without a suppressor; however, they will cycle most reliably with added back pressure provided by a suppressor or linear compensator.

Furthermore, if you do not plan on using a suppressor and would like to shoot light powered ammo, you can use one of our reduced power buffer springs and one of our lightweight carriers. The reduced mass in the action will help cycle with less gas.