Aero Precision M4E1 Enhanced Barreled AR-15 Upper 5.56 with FSB Gen 2 – 10.5″


  • 10.5” 5.56 barrel
  • 4150 CMV barrel
  • HPT and MPI
  • Salt bath Nitride finish
  • 1:7 twist rate
  • Carbine length gas system
  • Front sight gas block
  • M4E1 Enhanced forged 7075-T6 upper
  • Hardcoat anodized
  • Laser engraved T-marks
  • Scalloped picatinny top rail
  • Built in anti-rotation tabs
  • M-LOK slots
  • Forged handguard mount
  • Compatible with most BAR-system handguards
  • Does not include BCG or charging handle


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SKUAPAR640211M3 Category

Note: This barreled upper receiver assembly has a barrel length under 16” and is therefore subject to all NFA rules and regulations. Know your local laws before purchasing.

This M4E1 upper is forged from 7075-T6 aluminum and precision machined to M4E1 specs for a perfect fit with Mil-Spec and aftermarket parts. It’s finished with a matte black hardcoat anodize and laser engraved T-marks on the upper picatinny rail.

This 10.5” 5.56 barreled upper comes complete with the Enhanced Gen 2 M-LOK free float handguard. This handguard features improved ergonomics, a lightweight design, and scalloped picatinny top rail. It also has a large 1.78” inside diameter for use with suppressors.


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