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Aero Precision M4E1 Threaded AR-15 Barreled Upper Receiver 5.56 Carbine - ATLAS S-ONE - 11.5"APAR700302M29

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Aero Precision M4E1 Threaded AR-15 Barreled Upper Receiver 5.56 Carbine - ATLAS S-ONE - 11.5"

SKU: APAR700302M29
MPN: APAR700302M29

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 Aero Precision M4E1 Threaded upper receiver group comes completely assembled with an 11.5” 5.56 barrel and the ATLAS S-ONE M-LOK handguard. This barreled upper receiver group does not include BCG or a charging handle, allowing you to choose your favorites for your build. The upper receiver is, however, fully assembled with a forward assist and dust cover. The M4E1 threaded upper is made from forged 7075-T6 aluminum with a billet machined look that matches the lower and handguard. The ATLAS S-ONE, free float handguard, is 9” and features a 1.3” inner diameter that surrounds the low profile gas block and carbine length gas tube.

  • M4E1 threaded upper receiver
  • Forged 7075-T6 aluminum
  • Assembled forward assist and dust cover
  • 9” ATLAS S-ONE M-LOK handguard
  • Hardcoat anodized
  • 11.5” 5.56 NATO barrel
  • Carbine length gas system
  • 1:7 twist rate
  • Threaded 1/2x28
  • A2 flash hider
  • Salt Bath Nitride finished
  • Does not include BCG or charging handle

The 11.5” barrel is machined from Chrome Moly Vanadium steel with a salt bath Nitride finish and a 1:7 twist rate for stabilizing heavier rounds. It is threaded 1/2x28 with an A2 style flash hider that has not been pinned and welded meaning this must be attached to a pistol lower receiver. High pressure tested and magnetic particle inspected ensure this barrel is accurate and reliable. This Aero Precision AR-15 barreled upper is a great choice for finishing an AR build.

Aero Precision takes some of the most state-of-the-art manufacturing techniques and equipment derived from their work in the aerospace industry and applies it to their products in the firearms industry. They have utilized their knowledge from years of building aircraft components to design and engineer AR-15 handguards, receiver sets, scope mounts, and more. They treat every product as if it were a precision flying machine and adhere to strict quality standards to ensure law enforcement, military, and civilian customers receive a product they can rely on.

Aero 11.5 5.56


Barrel Coating
Salt Bath Nitride
Barrel Contour
Barrel Length
Barrel Lining
Salt Bath Nitride
Barrel Material
41V50 Chrome Moly Vanadium Steel
Aero Precision
Caliber Gauge
5.56 NATO
Hardcoat Anodized
Gas System Length
Gas System Type
Direct Impingement
9 in M-LOK Rail
Muzzle Device
A2 Flash Hider
Thread Pattern
1/2 X 28
Twist Rate