Dirty Bird 7.5″ Pistol 5.56 M-LOK AR-15 Complete Upper Assembly

Dirty Bird 7.5″ Pistol 556 M-LOK Upper Assembly

This Dirty Bird Industries Complete Upper features a Black Nitride 7.5″ Sub-MOA Heavy Profile barrel chambered in 5.56 with a 1:7 twist. Built on a top-tier t-marked Forged Upper Receiver and finished with Dirty Bird’s 9.5″ SMRS M-LOK handguard, available in several color options. 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 Loctite, ensuring that no amount of vibration will cause the set screws to come loose, but they will still be removable for servicing if needed.

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

Barrel

• Chambered in 5.56 (will also function with .223)
• 7.5″ Heavy Profile w/ 1:7 Twist
• Mid-Length Gas System
• Black Nitride Finish
• High Pressure Tested, Magnetic Particle Inspected, and Test Fired
• Recessed Flash Can

BCG

• Machined from Carpenter Technology No. 158 alloy.
• Heat treated
• Shot peened per ASTM B851/SAE AMS2430S
• Individually High-Pressure Tested (test-fired)
• HP proof testing, 100% using a high-pressure M197 or SAAMI commercial equivalent, without evidence of failure
• Individually Magnetic Particle Inspected after Initial Test Fire
• Manganese Phosphate Finish

Handguard

• Tough
  • Machined from aircraft-grade 6061-T6 aluminum extrusions.
  • Anti-rotation tabs.
  • Type 3 hard anodizing or Cerakote™ sprayed at 1 mil thickness per spec.
• Versatile
  • M-LOK attachment slots on all sides (except top)
  • 1913 Picatinny top rail with shaved and beveled center section.
  • Raised QD attachment points at the 3 and 9 o’clock positions.
  • Snag-free design with a smooth, uniform octagonal surface ideal for accessory attachment or application of specialty coatings or patterns.
• Practical
  • No extraneous cuts in the aluminum simply for the sake of weight savings or enhanced visual appearance.
  • Aircraft-grade aluminum barrel nut. In our tests, the aluminum barrel nuts are just as effective when torqued to spec. Additionally, the weight savings enable us to utilize a longer barrel nut design, which means more surface area at the attachment point without adding unnecessary weight.

Upper Receiver

• Precision Machined from Top Tier 7075-T6 Aluminum Forgings (forge marks may vary)
  M4 Feed Ramps
  • Not all forged 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
• Laser-etched T-marks

Available Handguard Colors:

Black, Magpul™ FDE, Magpul™ OD Green, Midnight Bronze

All NFA/ATF Rules Apply
You may use this AR-15 upper with a lower receiver that is a registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is prohibited, except when installed on a pistol-configuration firearm.