Aero Precision M5E1 Complete Upper Flat Dark Earth .308 Win 18″ Barrel

Aero Precision M5E1 Features

The 18-inch 4150 Chrome Moly Vanadium (CMV) steel barrel features a 1:10 twist rate, optimizing bullet stabilization for improved accuracy. The barrel is treated with a QPQ corrosion-resistant finish inside and out, enhancing durability and longevity. A rifle-length gas system ensures reliable cycling, while the .750-inch gas block journal accommodates low-profile gas blocks.

The M5E1 upper receiver is forged from 7075-T6 aluminum, providing strength without unnecessary weight. It includes M4 feed ramps and comes assembled with a forward assist and port door installed. The integrated handguard mounting platform simplifies assembly and enhances rigidity.

Paired with a 16.6-inch Gen 2 Enhanced M-LOK Handguard, this upper offers ample space for accessory attachment. The handguard features quick disconnect sling sockets at the 3, 6, and 9 o’clock positions, built-in anti-rotation tabs, and a continuous top rail for seamless integration of optics and sights. The 1.78-inch inside diameter accommodates most muzzle devices and 1.5-inch suppressors.

A standard .308 A2 birdcage flash hider is installed to reduce muzzle flash.

Aero Precision M5E1 Specifications

• Caliber: .308 Winchester
• Barrel Length: 18 inches
• Barrel Material: 4150 Chrome Moly Vanadium Steel
• Barrel Finish: QPQ corrosion-resistant finish
• Twist Rate: 1:10
• Gas System Length: Rifle
• Gas Block Journal: .750 inches
• Muzzle Thread Pattern: 5/8×24
• Muzzle Device: .308 A2 birdcage flash hider
• Upper Receiver Material: 7075-T6 aluminum
• Handguard Length: 16.6 inches
• Handguard Type: Gen 2 Enhanced M-LOK
• Handguard Material: 6061-T6 aluminum
• Handguard Features:
  • Quick disconnect sling sockets at 3, 6, and 9 o’clock positions
  • Built-in anti-rotation tabs
  • Continuous top rail
  • 1.78-inch inside diameter
• Finish: Flat Dark Earth (FDE) Cerakote
• Weight: Approximately 56.64 ounces