MPN: APAR700106M100


  • Caliber: .350 Legend
  • Finish: Type III Class 2 Hardcoat Anodized or Cerakote Flat Dark Earth
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: 16.6-Inch ATLAS R-ONE M-LOK Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 20" 1:16 QPQ Coated 4150 Chrome Moly Vanadium DMR Barrel
  • Muzzle Thread Pattern: 1/2"-28 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Carbine-Length Gas Tube
  • Bolt Carrier Group: Not Included
  • Charging Handle: Not Included
  • HP and MPI Tested

*This upper assembly does not come with Bolt Carrier Group and Charging Handle


  • Weight: ~3.95 lbs.
  • Length: ~28.47"


  • AR-15 lower receiver


  • 1x Aero Precision 20" M4E1 .350 Legend Complete Upper Assembly


The AR-15 is widely favored among firearm enthusiasts in the US. However, unfortunately for hunters, most states have regulations about hunting with small calibers like the 5.56. Additionally, some states have regulations that only allow hunters to use straight-walled cartridges for hunting.

Overcoming Hunting Regulations with the .350 Legend

The .350 Legend cartridge was designed with these regulations in mind. It is a straight-walled cartridge with a lot of stopping power, ideal for hunting, and here we have one of the best AR uppers chambered in it.

The M4E1.350 Legend Complete Upper Assembly from Aero Precision is an excellent option for anyone looking to build a versatile AR for hunting and personal defense. This upper comes with a 20-inch DMR profile barrel made from Chrome Moly Vanadium Steel for improved durability and performance. The barrel is threaded with a 1/2"-28 thread pitch and equipped with an A2 style flash hider.

Durable Components for Reliable Performance

This upper assembly used a low-profile gas block with a carbine-length gas tube for smooth and reliable performance. The gas system and barrel are covered by a modular aluminum handguard. The Aero Precision ATLAS R-ONE Handguard on this upper has M-LOK slots on both sides and the bottom, along with a full-length Picatinny rail on top for mounting sights and accessories.

This upper is constructed around the Aero Precision M4E1 Threaded Upper Receiver, which is made from 7075-T6 aluminum and has a super durable hardcoat anodized finish. Chambered in .350 legend, this upper receiver features a standard forward assist and a top Picatinny rail. Additionally, it has M4 feed ramps for reliable feeding, and all its parts are HP and MPI Tested for quality assurance.


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