Aero Precision M4E1 Threaded Barreled Upper .223 Wylde Fluted Mid-Length ATLAS R-ONE – 16″


  • M4E1 threaded upper receiver
  • Forged 7075-T6 aluminum
  • Assembled forward assist and dust cover
  • 15” ATLAS R-ONE M-LOK handguard
  • Hardcoat anodized
  • 16” .223 Wylde fluted barrel
  • Machined from Chrome Moly Vanadium
  • Mid-length gas system
  • 1:8 twist rate
  • Threaded 1/2×28
  • A2 flash hider
  • Salt Bath Nitride finished



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SKUAPAR700705M50 Category

Are you looking for a threadbare upper receiver group that comes with a 16” fluted barrel and the ATLAS R-ONE M-LOK handguard? If so, then look no further than the Aero Precision M4E1 threaded barreled upper .223 Wylde fluted mid-length ATLAS. This receiver group is perfect for those who want to choose their own BCG and charging handle because it comes without them. The upper receiver is, however, fully assembled with forward assist and dust cover. Additionally, the M4E1 threaded upper is made from forged 7075-T6 aluminum which gives it a billet machined look that matches the lower and handguard.

This upper features a 16″ barrel machined from Chrome Moly Vanadium steel with a salt bath Nitride finish. It has a 1:8 twist rate for stabilizing a variety of bullet weights, and is threaded 1/2×28 with an A2 style flash hider. The barrel is high pressure tested and magnetic particle inspected to ensure accuracy and reliability. Don’t settle for less – trust Aero Precision for all your AR needs!


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