Aero Precision M5E1 Barreled Upper .308 Enhanced Gen 2 M-LOK - 18" - Black

Manufactured by Aero Precision
SKU: APAR308554M25
MPN: APAR308554M25
Manufactured by Aero Precision
1 Review

Out of Stock

For individual Officer, First Responder, and Military pricing please make sure you are logged in. for details



Get your 308 Winchester AR build off to the right start with these Aero Precision M5E1 18 inch 308 Upper Receiver. Because there's no industry standard for 308 AR-pattern rifles, home builds can get problematic quickly, as you have to take time to make sure all your parts are compatible. With this assembled 308 AR upper from Aero Precision, you can shortcut that entire process. This upper receiver includes everything you need except the bolt carrier group and charging handle. The receiver is forged 7075 T6 aluminum that's been machined to Aero's specifications. The M5E1 308 upper is designed to be compatible with common DPMS pattern 308 Winchester AR components, which are readily available. With an 18 inch 4150 Chrome Moly Vanadium Steel barrel and a rifle length gas system, the Aero M5E1 308 upper balances recoil control and long range accuracy.

  • 15 inch aluminum M-LOK rail with anti-rotation tabs
  • Includes forward assist and ejection port cover
  • Optics ready with full length Picatinny rail on receiver and handguard
  • 1 in 10 twist barrel
  • Black anodized finish

Along with the upper receiver, the M5E1 comes with a 15 inch M-LOK railed handguard. The handguard is machined out of 6061-T6 Aluminum for maximum durability. The Picatinny rail runs the entire length of the top of the handguard, giving the shooter ample space for mounting sights, lights, and other accessories. The 1.8 inch inner diameter of the handguard provides enough clearance for suppressors with an 1.5 inch external diameter. This rail is a single piece of aluminum, making it completely free float, helping enhance the rifle's accuracy.

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.
See More


Barrel CoatingSalt Bath Nitride
Barrel ContourHeavy
Barrel Length18
Barrel LiningSalt Bath Nitride
Barrel Material41V50 Chrome Moly Vanadium Steel
BrandAero Precision
Caliber Gauge.308 Win
FinishHardcoat Anodized
Gas System LengthRifle
Gas System TypeDirect Impingement
Handguard15 in Aero Precision Gen2 Enhanced M-LOk Handguard
Muzzle DeviceA2 Flash Hider
Thread Pattern5/8 X 24
Twist Rate1:10
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

1 review

  • 4 stars
  • 0 reviews
  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Aero upper

by -

Happy with purchase. Fast shipping