Aero Precision - M4E1 Threaded Complete Upper, 16" 5.56 HBAR Mid-Length Barrel, 15" ATLAS R-One M-LOK Handguard

Aero Precision
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(1 review)
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This Aero Precision complete upper receiver incudes an HBAR profile barrel that is laser marked "HBAR".


  • M4E1 Threaded Upper Receiver
  • 15" ATLAS R-ONE Handguard
  • 16" 5.56 HBAR barrel
  • Low Profile Gas Block and Mid-Length Gas Tube
  • Port Door Assembly
  • A2 Flash Hider
  • Does NOT include BCG and Charging Handle

M4E1 Threaded Upper Receiver Features:

  • 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

ATLAS R-One Handguard Features:

  • Full top picatinny rail for optional attachments
  • Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.3” Inside diameter
  • 1.5” Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels

16" 5.56 HBAR Mid-length Barrel Features:

  • 5.56 Nato 16" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-Length Gas System
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider
5.56 NATO


  • 5
    Value and Speed

    Posted by Karl on Aug 5th 2023

    Aero quality. All components fit snugly, nothing out of place. Very light weight for an HBAR. Had a question about this upper so I called their customer service and lo and behold somebody answered the phone. Very professional customer service. I ordered before noon and this was shipped the same day. Excellent price, excellent upper and service.