Aero Precision M4E1-T Complete Upper, 13.9" 5.56 Mid-Length Gov Profile Barrel, 12.7" MOD 4 Handguard - Black

Aero Precision M4E1-T Complete Upper, 13.9″ 5.56 Mid-Length Gov Profile Barrel, 12.7″ MOD 4 Handguard – Black

The Aero Precision M4E1-T Complete Upper, 13.9″ 5.56 Mid-Length Gov Profile Barrel, 12.7″ MOD 4 Handguard – Black is a balanced solution for shooters who want maximum versatility without the NFA paperwork. This configuration is ideal for those who plan to pin and weld a muzzle device to meet the legal 16″ overall length requirement.

The barrel is machined from 4150 Chrome Moly Vanadium steel and finished in QPQ Nitride for long-term durability. A 1:7 twist rate provides reliable stabilization of standard and heavier 5.56 NATO loads, while the carbine gas system promotes consistent cycling and smooth recoil. The included low-profile gas block is precisely aligned and torqued, ensuring performance right out of the box.

The 12.7″ MOD 4 Handguard provides a generous platform for accessories, optics, and forward controls. With M-LOK compatibility and a continuous top Picatinny rail, it supports a wide variety of setups, from minimalist to mission-oriented. The slim profile improves ergonomics, and the free-float design eliminates barrel contact for maximum accuracy.

Aero’s M4E1 upper receiver is forged from 7075-T6 aluminum and includes a pre-installed port door and forward assist. The M4 Feed Ramp Extension enhances reliability when running various types of ammunition. The barrel is threaded 1/2×28 to accommodate common muzzle devices and suppressors, and the recessed 11° target crown protects the muzzle from damage and preserves accuracy.

Designed for compatibility with all standard AR15 lowers and components, this upper is an excellent choice for modern builders who want the shorter look and balance of a 13.9″ build while maintaining mil-spec performance and Aero Precision reliability.