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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.
| Caliber | .350 Legend |
| Barrel Length | 16" |
| Barrel Profile | DMR |
| Barrel Material | 4150 CrMoV |
| Barrel Finish | QPQ hardened |
| Twist Rate | 1:16 |
| Gas System | Carbine length |
| Gas Port Diameter | .0785" |
| Gas Block Journal | .750" |
| Upper Receiver Type | M4E1-T Threaded |
| Feedramps | M4 |
| Takedown Pin Holes | .250" |
| Handguard | ATLAS R-ONE |
| Handguard Inner Diameter | 1.3" |
| Handguard Outer Diameter | 1.5" |
| Finish | FDE |
| Condition | Factory assembled |
Yes. The M4E1-T upper is compatible with standard mil-spec AR15 lower receivers. The .250" takedown pin holes match mil-spec dimensions.
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.
Yes, the ATLAS R-ONE is specifically designed to work with low-profile gas blocks without clearance issues.
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.
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.
| Caliber | .350 Legend |
| Barrel Length | 16" |
| Barrel Profile | DMR |
| Barrel Material | 4150 CrMoV |
| Barrel Finish | QPQ hardened |
| Twist Rate | 1:16 |
| Gas System | Carbine length |
| Gas Port Diameter | .0785" |
| Gas Block Journal | .750" |
| Upper Receiver Type | M4E1-T Threaded |
| Feedramps | M4 |
| Takedown Pin Holes | .250" |
| Handguard | ATLAS R-ONE |
| Handguard Inner Diameter | 1.3" |
| Handguard Outer Diameter | 1.5" |
| Finish | FDE |
| Condition | Factory assembled |
Yes. The M4E1-T upper is compatible with standard mil-spec AR15 lower receivers. The .250" takedown pin holes match mil-spec dimensions.
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.
Yes, the ATLAS R-ONE is specifically designed to work with low-profile gas blocks without clearance issues.
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.
