Aero Precision M4E1 Threaded Complete Upper 5.56 18″ Barrel

Aero Precision M4E1 Threaded Complete Upper Features

The 18-inch CMV barrel is made from 4150 CrMoV steel with a QPQ finish, ensuring outstanding durability and resistance to corrosion. Featuring a rifle-length gas system, a 1:7 twist rate, and an A2 flash hider, this barrel delivers consistent performance with various ammunition types. The low-profile gas block enhances reliability and complements the clean aesthetics of the build.

The 15-inch ATLAS R-ONE M-LOK handguard offers a lightweight and slim profile with full M-LOK compatibility for versatile accessory mounting. Its integrated quick disconnect sling sockets provide added utility for sling setups. The M4E1 threaded receiver includes laser-engraved T-marks, M4 feed ramps, and pre-installed port door and forward assist for out-of-the-box readiness. Note: This complete upper does not include a BCG or charging handle, allowing for user customization.

Aero Precision M4E1 Threaded Complete Upper Specifications

• Manufacturer: Aero Precision
• Model: M4E1 Threaded Complete Upper Receiver
• Cartridge: 5.56 NATO
• Barrel Length: 18″
• Gas System: Rifle-Length
• Barrel Material: 4150 CrMoV Steel with QPQ Finish
• Twist Rate: 1:7
• Handguard: 15″ ATLAS R-ONE, M-LOK Compatible
• Receiver: M4E1 Threaded, Anodized Black
• Gas Block: Low Profile, .750″ Journal
• Thread Pattern: 1/2×28 (A2 Flash Hider Installed)
• Features:
  • M4 Feedramps
  • Laser Engraved T-Marks
  • Port Door and Forward Assist Installed
  • Lightweight ATLAS R-ONE Handguard (1.3″ ID, 1.5″ OD)
  • Quick Disconnect Sling Sockets