Aero Precision

Aero Precision 11.5" 5.56 M4E1 Threaded Pistol Build Kit

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MSRP: $830.00
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Aero Precision 11.5" 5.56 M4E1 Threaded Pistol Build Kit

The Aero Precision 11.5" 5.56 M4E1 Threaded Pistol Build Kit is the pinnacle of design and functionality, combining top-tier components suited for enthusiasts seeking superior performance and reliability. This kit features the M4E1 Threaded Assembled Upper Receiver, complete with the sleek ATLAS R-ONE M-LOK Handguard, designed for a lightweight, streamlined profile without sacrificing durability. The 11.5" 5.56 CMV barrel offers a balance of maneuverability and precision, ideal for a carbine-length gas system that ensures reliable operation under various conditions.

The kit includes the necessary parts to assemble an Aero Precision AR15 Gen 2 or other mil-spec lower receivers, highlighted by including a Magpul MOE Grip and Trigger Guard for enhanced ergonomics. The Enhanced Pistol Buffer Kit has a 7075-T6 Aluminum Pistol Buffer Tube and other key buffer components designed for smooth cycling and reduced recoil. Note that the complete upper arrives assembled but does not include a BCG or Charging Handle, and the muzzle brake is not pinned or welded, allowing for further customization. This kit not only merges Aero Precision's engineering excellence with practical enhancements but also offers the aesthetic appeal of a billet-like upper receiver and seamless integration with enhanced handguards.


  • M4E1 Threaded Assembled Upper Receiver
  • 10.3″ ATLAS R-ONE M-LOK Handguard
  • 11.5″ 5.56 CMV Barrel, Carbine Length
  • Low Profile Gas Block and Carbine Length Gas Tube
  • Product comes assembled
  • This complete upper does not include BCG or Charging Handle
  • The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel
  • Lower Parts Kit w/MOE grip and trigger guard
  • Enhanced Pistol Buffer Kit


  • New enhanced forging that gives the upper receiver a “billet look”
  • New picatinny profile that blends seamlessly with our Enhanced Series Handguards
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes port door and forward assist installed
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