Aero Precision M4E1-T Complete Upper 13.9″ 5.56 NATO Mid-Length Gov Profile Barrel, 12.7″ Atlas Handguard – Kodiak Brown
The AAero Precision M4E1-T Complete Upper 13.9″ 5.56 NATO Mid-Length Gov Profile Barrel, 12.7″ Atlas Handguard – Kodiak Brown is a compact, visually striking upper designed for performance and durability. Featuring a 12.7-inch 4150 CMV government profile barrel chambered in 5.56 NATO, this upper is optimized for both 5.56 and .223 Rem ammunition, offering versatile compatibility and reliable performance in a wide range of shooting scenarios. The unique Kodiak Brown finish adds a premium aesthetic to your AR-15 build while retaining the rugged dependability Aero Precision is known for. It includes a 1:7 twist rate to optimize performance with 5.56 NATO rounds.
Built around the M4E1-T Threaded Upper Receiver, this complete upper features a robust forged body, integrated handguard mounting system, and precision-machined picatinny rail for optics and sights. The barrel is paired with a mid-length gas system—a rare combination for this barrel length—designed to offer smoother cycling, improved recoil control, and superior reliability, especially when running suppressed. A pinned low-profile gas block ensures long-term durability and alignment under hard use.
The included ATLAS R-ONE free-float handguard, also finished in Kodiak Brown, provides a lightweight yet strong platform for mounting mission-critical M-LOK accessories. At the muzzle, the VG6 GAMMA 556 muzzle brake is factory-installed to reduce felt recoil and muzzle rise, enabling faster, more controlled follow-up shots. This complete upper also features the BREACH ambidextrous charging handle as part of the MOD 4 configuration, offering enhanced ergonomics and durability in high-pressure environments.
This upper does not include a bolt carrier group, allowing you to pair it with your preferred BCG to match your performance goals. Whether you’re building a compact defensive rifle, a suppressor-ready setup, or just want a standout color scheme, this complete upper delivers the reliability and design quality Aero Precision is known for.
* Bolt carrier group not included.
* This is a complete upper receiver group.
Product Information
| Product Type | Upper Receiver, Complete Upper |
|---|---|
| Material | 4150 Chrome Moly Vanadium, 7075-T6 Aluminum |
| Muzzle Thread | 1/2×28 |
| Handguard | 12.7" M-LOK |
| Series | ATLAS, M4E1 |
| Color | Kodiak Brown |
| Manufacturer | Aero Precision |
| Length | 13.9" |
| Platform | AR15 |
| Finish | Anodized |
| Caliber | 5.56 NATO |
| Gas System | Mid-Length |
| Twist Rate | 1:7 |
| Barrel Finish | QPQ Nitride |
| Compatibility | Standard AR15 components |
| Made in USA | Yes |
Important!
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