MDX Arms 10.5" 300BO 416RSS 1:8T GT Ultra Lightweight MLok HG and LT Brake Complete Upper

  • $499.95
  • Save $46

Upper Receiver

  • T6 7075 Forged HA Type III
  • M4 Feed Ramp
  • Standard Mil-Spec Dust Cover & Forward Assist

Charging Handle

  • Standard Mil-Spec Charging Handle

Bolt Carrier Group

  • Black Nitride / QPQ Finish
  • M16 Full Auto with Staked Gas Keys
  • 9310 Steel MPI tested bolt & 8620 Steel Carrier.
  • Compatible with 5.56 NATO, .223 Remington & 300 AAC Blackout.
  • Corrosion resistance inside and out. Superior to chrome lined and parkerized bolt carrier groups.
  • Slicker hardened 70RC surface
  • Includes extractor o-ring for increased extracting reliability.

Barrel/Gas Block

  • 10.5" .300 Black Out
  • 1:8 Twist
  • 416R Stainless Steel Barrel
  • .750 Low Profile Steel Gas Block - Screw On
  • Pistol Length Gas System


      • 10" Ultralight Weight Series Mlok Handguard 

      Flash Hider/Muzzle Brake

      • LT Brake- 5/8x24 

      Check your local laws before purchasing this item. MDX Arms and it's Affiliates Will not be responsible for misuse of this barrel/product. Legal for use on properly registered AR pistols only.

      All NFA rules apply.

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