Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Rifle Atlas S-One - 18"

The Aero Precision AR-15 barreled upper receiver is built around the M4E1 Threaded upper receiver designed for use with standard barrel nut setups. The receiver is forged from 7075-T6 aluminum and precision machined to M4E1 specs to ensure proper fit with Mil-Spec and aftermarket parts. It is matte black hardcoat anodized and features laser engraved T-marks. This 18” 5.56 barreled upper comes with the Atlas S-One M-LOK free float handguard with a slim 1.3" inner diameter.

Features:
18” 5.56 NATO
4150 Chrome Moly Vanadium barrel
HPT and MPI
Black Nitride finish
1:7 twist rate
Rifle length gas system
M4E1 Threaded forged 7075-T6 upper
Hardcoat anodized
Laser engraved T-marks
Scalloped picatinny top rail
Built in anti-rotation tabs