MPN: APAR308554M22 / APAR308556M22


  • Caliber: .308 Win
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • 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: 16-Inch 1:10 QPQ Coated 4150 Chrome Moly Vanadium
  • Muzzle Thread Pattern: 5/8"-24 TPI
  • Gas Block: Aero .750" Low-Profile Gas Block
  • Gas Tube: Mid-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: ~4.33 lbs.
  • Overall Length: ~25.75"


  • DPMS LR-308 style lower receivers


  • 1x Aero Precision Enhanced 16" .308 CMV M5E1 Complete Upper Assembly


The 5.56 is a competent round for self-defense and even hunting. However, if you want to make longer shots, and hunt big game, you need a battle rifle round, like the .308 Winchester.

The AR is an excellent platform for the 308 cartridges, and if you are thinking about building a .308 chambered AR-15, then you'll need a high-quality barrel and upper assembly. The Aero Precision Enhanced 16" .308 CMV M5E1 Complete Upper Assembly is an excellent option that includes the parts to help you build an accurate, reliable, and smooth shooting rifle.

A High-Quality Barrel

The Aero Precision Enhanced Upper Assembly includes a high-quality 16-inch CMV barrel chambered for .308 Winchester. CMV is a type of Mil-Spec steel developed for military-issued M4s. It is pretty similar to 4150 steel and contains Vanadium, which significantly increases the barrel's strength, hardness, and high-temperature stability.

Moreover, the barrel also has a QPQ finishing both inside and outside to make it extremely corrosion resistant. The barrel has also been HP/MPI tested so that there aren't any minor fractures in it, so you can be confident that it will last for a very long time.

The barrel has a 1 in 10 twist rifling and is threaded too. It comes equipped with an A2 flash hider.

A Smooth and Reliable Gas System

When it comes to the shooting experience of a AR 308, the gas system plays a very important role. In this upper parts assembly, you will get a mid-length gas system, which is known to be a lot more comfortable to shoot than a carbine length gas system. Though that might not be as important to some people with a 5.56 AR-15, .308 is a hefty round and carries a lot of energy. So, the recoil is also stronger, and a mid-length gas system can help mitigate it to some extent.

Lightweight Upper and Handguard

With any rifle, you want it to be light and maneuverable. Well, the Aero Precision M5E1 Complete Upper is precision machined to be lightweight and durable. To ensure reliable feeding of the .308 round, this upper also has m4 feed ramps and features a forward assist.

You also get a really cool and lightweight full-length handguard, which has a one-piece free-floating design. It has a full-length top rail to mount scopes, sights, and M-LOK slots on both sides as well. The handguard has quick disconnect sling sockets at the 3, 6, and 9 o'clock positions.

Final Thoughts:

If you are looking for a modern, lightweight .308 chambered rifle that has good long-range capabilities, a 308 chambered AR is an excellent option. They are affordable, easy to use, have incredible aftermarket support, and quite fun to shoot. This complete upper assembly is perfect for anyone building a .308 AR-15.

Have a question?

Ask an Expert

Frequently Bought Together

  • This Item: Aero Precision Enhanced 16" .308 CMV M5E1 Complete Upper Assembly
    Choose Options
    $699.99 - $739.99

Total Price:

Add to Cart