Aero Precision M4E1 Threaded 16″ 5.56 M4 Barreled AR-15 Upper Receiver – 15″ M-LOK ATLAS S-ONE Handguard


1 in stock

SKU: APAR700305M6 Categories: , , ,



The Aero Precision M4E1 Threaded AR-15 Barreled Upper Receiver is perfect for shooters who are looking for a little more out of their build. The unique receiver forging blends seamlessly into the lightweight ATLAS S-ONE free float M-LOK handguard. The billet look comes without the weight and cost. The barrel nut with taper lock mount allows for an incredibly rigid free floating rail, meaning your sights and lasers will be deflected less than traditional options will be when shooting from the prone or supported.

Note: Barreled Upper Assembly does not include bolt carrier group or charging handle.


  • One piece forged upper receiver
  • Lightweight 15? ATLAS S-ONE free float M-LOK rail
  • Blended flat top receiver rail
  • 16? M4 contour 41V50 chromoly vanadium steel barrel with durable nitride finish is high pressure tested and magnetic particle inspected
  • 1:7 twist stabilizes even the heaviest 5.56 NATO bullets
  • Matching M4 feed ramps for receiver and barrel
  • Billet aesthetics without the billet cost or weight
  • Fully compatible with standard AR-15 bolt carrier groups and charging handles (available separately)
  • Effective A2 flash hider
Additional information

Additional information

Weight 5.5 lbs
Dimensions 36 × 4 × 4 in


Aero Precision

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All ammo must ship via UPS