MPN: APAR308554M26 / APAR308556M26


  • Caliber: .308 Win
  • Finish: Type III Class 2 Hardcoat Anodized or Cerakoted Flat Dark Earth
  • Upper Receiver: Aero Precision M5E1 Upper (DPMS High Profile) - 7075-T6 Aluminum
  • Handguard: 15-Inch Gen 2 Enhanced M-LOK Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 18-Inch 1:10 416R Stainless Steel Barrel
  • Muzzle Thread Pattern: 5/8"-24 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Rifle-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: ~5.24 lbs.
  • Overall Length: ~27.75"


  • DPMS LR-308 style lower receivers


  • 1x Aero Precision Enhanced 18" .308 Stainless Steel M5E1 Complete Upper Assembly


Aero Precision has multiple options for .308 upper receivers, and their M5E1 complete upper assembly is one of the best options for a high-quality .308 upper build. This DPMS low-profile receiver comes with a super-strong rifle-length barrel, a low-profile gas system, and a modern handguard.

If you are looking for a smooth shooting rifle chambered in .308 that is also super practical and reliable, the Aero Precision M5E1 Complete Upper 18-Inch upper assembly is the way to go.

Stainless Steel Threaded Barrel

The M5E1 Complete Upper upper assembly comes with a high-quality 18-Inch barrel made from 416R Stainless Steel with a bead blasted finish. It is super strong and corrosion-resistant, so it will last you a very long time.

The barrel has a 1 in 10 twist rifling and is also threaded in the 5/8 x 24 thread pitch so that you can add any muzzle attachments, like compensators, flash hiders, suppressors, and muzzle breaks to it. Initially, the barrel comes with a standard A2-style flash hider.

Moreover, to ensure that the barrel has a seamless fit with the receiver, it has a DPMS barrel extension. The barrel is also HP and MPI tested to keep up with the high-quality standards that are a hallmark of Aero Precision products.

Enhanced Handguard

Having a nice handguard can instantly give your rifle a premium feel and appearance. The M5E1 upper assembly features the Aero Precision Gen 2 enhanced handguard, which is machined from 6061-T6 aluminum made in a single-piece free-floating design for improved accuracy and durability. In addition, the handguard stays solid with the rifle because of the built-in anti-rotation tabs.

The Gen 2 handguard features a continuous top Picatinny rail for mounting optics and other accessories. The rail is also scalloped for a more comfortable and firm grip. The sides have M-LOK attachment slots, and you also get QD sling attachment points at 3, 6, and 9 o'clock.

Reliable and Smooth Shooting Gas System

The M5E1 upper receiver assembly features a low-profile gas system with a rifle-length gas tube, which is ideal for the 18-inch barrel and the .308 cartridge. It ensures the reliable operation of the rifle by decreasing the fire rate, and allowing the rounds more time to feed properly into the chamber. Moreover, the longer gas tube also decreases the gas pressure on the gas key, resulting in a longer life span.

High-Quality Upper Receiver

The upper receiver is the most important part of a rifle, and with this upper assembly, you get a DPMS high profile receiver for .308. It integrates seamlessly with the Gen2 handguard, and is made with precision machining to be up to specifications.

The receiver is forged from 7075 T6 aluminum and comes with a preinstalled forward assist and port door, which can help keep your receiver cleaner. The receiver also has M4 feed ramps for more reliable operation.

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  • This Item: Aero Precision Enhanced 18" .308 Stainless Steel M5E1 Complete Upper Assembly
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