Aero Precision M4E1 Threaded Barreled AR-15 Upper .223 Wylde Fluted Rifle Atlas S-One – 18″


  • 18” .223 Wylde barrel
  • 416R stainless steel fluted barrel
  • HPT and MPI
  • Bead blasted finish
  • 1:8 twist rate
  • Rifle length gas system
  • M4E1 Threaded forged 7075-T6 upper
  • Hardcoat anodized
  • Laser engraved T-marks
  • Interrupted picatinny top rail
  • Built in anti-rotation tabs
  • M-LOK slots
  • Does not include BCG or charging handle


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SKUAPAR700305M51 Category

The Aero Precision AR-15 barreled upper receiver is the perfect choice for your next AR-15 build. The M4E1 Threaded upper receiver is forged from 7075-T6 aluminum for strength and durability, and is machined to Mil-Spec dimensions to ensure proper fit with all standard parts and aftermarket components. This 18” .223 Wylde barreled upper comes with the Atlas S-One M-LOK free float handguard, which features improved ergonomics and a lightweight design with scalloped picatinny top rail. The handguard also has a slim 1.3″ internal diameter with indexing grooves for a comfortable grip. The receiver is finished with a matte black hardcoat anodized finish and laser engraved T-marks on the upper picatinny rail, making it a great looking as well as functional addition to your next build.


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