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

Aero Precision M4E1 Threaded Barreled AR-15 Upper 5.56 Rifle Atlas S-One - 18 SKU: APAR700305M8 MPN: APAR700305M8   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 M-LOK slots Does not include BCG or charging handle The 5.56 NATO 18” barrel is machined from 4150 CMV steel with a salt bath Nitride fini