Aero Precision

Aero Precision M4e1 Complete Upper 5.56mm 16 " Barrel W/15 " Atlas R- One, Vg6 Gamma 556, Breach Ch

Item# APSL100366

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This complete upper bundle has everything you need to hit the ground running on your next build! Included ATLAS Handguard, 5.56 PRO Bolt Carrier Group, Adjustable Gas Block, BREACH Ambidextrous Charging Handle, and VG6 GAMMA Muzzle Device give you all the upgrades you need out of the box!



  • M4E1 Threaded Assembled Upper Receiver - Anodized Black
  • 15" ATLAS R-ONE Handguard
  • 16" 5.56 CMV Barrel, Mid-Length
  • .750 Adjustable Low Profile Gas Block, Aero Logo - Nitride
  • Stainless Steel Mid-Length Gas Tube
  • AR15 BREACH Ambidextrous Charging Handle (Large Lever)
  • 5.56 PRO Bolt Carrier Group
  • VG6 Gamma 556 Muzzle Device

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 Mid-Length Barrel Features:


  • 5.56 NATO 16" Midlength, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-length gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
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