Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Carbine 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” 5.56 NATO barrel
  • Machined from Chrome Moly Vanadium
  • Carbine length gas system
  • 1:7 twist rate
  • Threaded 1/2×28
  • A2 flash hider
  • Salt Bath Nitride finished


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SKUAPAR700705M6 Category

The Aero Precision M4E1 Threaded AR-15 Upper Receiver is a complete upper receiver assembly that is built using high quality components and construction techniques. The upper receiver is made from forged 7075-T6 aluminum and features a billet machined look that matches the Aero Precision M4E1 Lower Receiver. The M4E1 threaded upper receiver comes with a 16” 5.56 carbine length barrel and is compatible with a wide variety of different handguards and muzzle devices. The ATLAS R-ONE free float handguard is 15” long and features a 1.3” inner diameter that surrounds the low profile gas block and carbine length gas tube.

The Aero Precision M4E1 Threaded Barreled AR-15 Upper is perfect for your next build. The 16″ barrel is machined from high quality Chrome Moly Vanadium steel and finished with a salt bath Nitride finish for durability and corrosion resistance. The 1:7 twist rate is perfect for stabilizing heavier rounds, and the upper is threaded 1/2×28 with an A2 style flash hider. High pressure testing and magnetic particle inspection ensure that this barrel is accurate and reliable. Complete your AR build with this high quality Aero Precision upper.


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