Aero Precision M4E1 Threaded Barreled Upper 5.56 Pistol Atlas R-One – 7.5″


  • 7.5” 5.56 barrel
  • 4150 CMV barrel
  • HPT and MPI
  • Salt bath Nitride finish
  • 1:7 twist rate
  • Carbine length gas system
  • M4E1 Enhanced forged 7075-T6 upper
  • Hardcoat anodized
  • Laser engraved T-marks
  • Scalloped picatinny top rail
  • Built in anti-rotation tabs
  • M-LOK slots
  • Does not include BCG or charging handle


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SKUAPAR700701M0 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.

Looking to upgrade your AR-15? Check out the Aero Precision M4E1 Threaded Barreled Upper! This barreled upper receiver is forged from 7075-T6 aluminum for durability and precision machined to M4E1 specs for a perfect fit with Mil-Spec and aftermarket parts. It features a matte black hardcoat anodized finish and laser engraved T-marks on the upper picatinny rail. The 7.5” 5.56 barrel is topped off with the Atlas R-One M-LOK free float handguard. This handguard provides a full length picatinny top rail and slime 1.3″ inner diameter for a comfortable grip. Get the most out of your AR-15 with the Aero Precision M4E1 Threaded Barreled Upper!


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