Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver .300 BLK Pistol - ATLAS R-ONE - 10"

Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver .300 BLK Pistol - ATLAS R-ONE - 10"

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Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver .300 BLK Pistol - ATLAS R-ONE - 10"

SKU: APAR700702M4
MPN: APAR700702M4

Aero Percision 300blk


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 Upper does not include a BCG or charging handle.

This Aero Precision M4E1 Threaded upper receiver group comes completely assembled with a 10” .300 Blackout barrel and a pistol-length gas system to ensure reliable function. Forged from 7075-T6 aluminum, this upper receiver features a billet design at a much lower cost and looks great when paired with the M4E1 lower receiver. The ATLAS R-ONE, free float handguard, is made from the same material with the same hard coat anodized finish and features a lightened profile with M-LOK slots for accessories. This .300 Blackout AR-15 barreled upper receiver assembly does not include a BCG or charging handle but does include the forward assist and dust cover. Build a high-quality .300 BLK AR pistol today with the M4E1 upper receiver assembly.

  • M4E1 threaded upper receiver
  • Forged 7075-T6 aluminum
  • Assembled forward assist and dust cover
  • 9” ATLAS R-ONE M-LOK handguard
  • Hardcoat anodized
  • 10” .300 Blackout barrel
  • Machined from Chrome Moly Vanadium
  • Pistol-length gas system
  • 1:7 twist rate
  • Threaded 5/8x24
  • A2 flash hider
  • Salt Bath Nitride finished
  • Does not include BCG or charging handle

The 10” 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 5/8x24 with an A2 style flash hider. High pressure was tested, and magnetic particles were inspected to ensure this barrel is accurate and reliable. This Aero Precision AR-15 barreled upper is an excellent 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 them 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.