AERO M4E1-T COMPLETE UPPER 16 350 QPQ FDE

The Aero M4E1-T Complete Upper in 16" .350 Legend with FDE finish is a factory-assembled, ready-to-mount upper receiver built for hunters and shooters who want a modernized platform without the assembly hassle. This complete upper pairs Aero's enhanced M4E1 upper with a purpose-built DMR profile barrel and their slim, lightweight ATLAS R-ONE handguard—everything you need to mount directly to a compatible lower receiver and get to the range or field.

The M4E1-T upper receiver features an enhanced forging that gives it a refined, billet-like appearance while maintaining full compatibility with Aero's Enhanced Series handguards. The integrated M4 feedramps, port door, and forward assist come pre-installed. The threaded design accepts low-profile accessories, and laser-engraved T-marks aid in alignment. The .250 takedown pin holes work with standard AR-platform lowers.

Your barrel is a 16" DMR-profile 4150 CrMoV chrome-moly steel with QPQ hardening—a tough, reliable choice that balances handling and velocity in .350 Legend. The carbine-length gas system keeps the profile trim, and the barrel has been HP and MPI tested for quality assurance. M4 feed ramp extension and a standard 9mm A2 flash hider round out the package.

The ATLAS R-ONE handguard is designed to be lightweight and nimble without sacrificing real estate for optics, lights, and accessories. Full-length top picatinny rail, quick-disconnect sling attachment points at 3, 6, and 9 o'clock, and a slim 1.3" inner diameter make it intuitive to configure. It's compatible with low-profile gas blocks and all mil-spec AR15 upper receivers and barrels.

Key Features

• Factory-assembled complete upper — no gunsmithing required
• M4E1-T threaded upper receiver with enhanced forging and integrated M4 feedramps
• 16" DMR-profile .350 Legend barrel, 4150 CrMoV QPQ hardened steel
• Carbine-length gas system with low-profile gas block pre-installed
• ATLAS R-ONE handguard with full picatinny rail and sling mounts at 3, 6, and 9 o'clock
• Slim, lightweight design — ATLAS handguard 1.3" ID / 1.5" OD
• Port door and forward assist installed
• HP and MPI tested barrel
• FDE finish

Specifications

Frequently Asked Questions

Will this upper work with my mil-spec AR lower?

Yes. The M4E1-T upper is compatible with standard mil-spec AR15 lower receivers. The .250" takedown pin holes match mil-spec dimensions.

What's included in the box?

You get the M4E1-T threaded upper receiver fully assembled, the ATLAS R-ONE handguard already installed, and the 16" .350 Legend barrel with low-profile gas block and carbine-length gas tube already mounted. The port door and forward assist are installed. It's ready to mate to a compatible lower.

Can I use a low-profile gas block with the ATLAS R-ONE handguard?

Yes, the ATLAS R-ONE is specifically designed to work with low-profile gas blocks without clearance issues.

What is .350 Legend, and is it a good hunting cartridge?

We provide the specs and quality; use of any cartridge for hunting should be verified against your state's regulations and your own expertise. This barrel is configured for .350 Legend and is twist-rate optimized for that cartridge.