Dirty Bird 13.7" Government Midlength 5.56 NATO M-LOK V3 Upper Assembly

SKU# D107 | by Dirty Bird Industries
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This Dirty Bird Industries Complete Upper features a Dirty Bird Midlength Sub-MOA 416R Medium Profile barrel chambered in 5.56 with a 1:8 twist. Built on a top-tier Forged Upper Receiver, no corners are cut when manufacturing these complete uppers. All barrels are dimpled and cold blued, use a black nitride 4140 steel gas block and a stainless steel gas tube. The gas block set screws feature knurled cone tops and are installed using blue locktite ensuring that no amount of firing will cause the set screws to come loose but they will still able to be removed for servicing if needed.

**Does NOT include BCG or Charging Handle

Made in the USA – Backed by Dirty Bird Industries’ Limited Lifetime Warranty


  • Chambered in 5.56 (will also function with .223)
  • 13.7" Medium Profile w/ 1:8 Twist
  • Midlength Gas System
  • Black Nitride Finish
  • Magnetic Particle Inspected
  • 416R Stainless Steel
  • Sub-MOA Guarantee

Upper Receiver

  • Precision Machined from Top Tier 7075-T6 Aluminum Forgings (forge marks may vary)
    • Not all foged uppers are created equal and we only use the best for our uppers meaning they will be free from excessive pitting, machined to spec and finished with quality (not purple or chalky) hard coat anodizing
  • M4 Feedramps
  • Forge Markings may vary
  • May or may not have T-Marks


  • Patented ASAL (Anti-Slip, Anti-Lift) mounting system
  • Included M-LOK QD Mount
  • “Competition Cut” top rail (V2) or continuous picatinny top rail (V3).

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