Aero M4e1-t Upper 308win 16"

The Aero Precision M4E1-T upper receiver for .308 Win is a complete, factory-assembled upper built around a 16" barrel and designed for shooters who want a ready-to-run .308 platform without the guesswork. This is a no-compromise combo: you get a forged aluminum upper, mid-length gas system, and Aero's proven ATLAS R-ONE handguard all working together out of the box. Drop in your bolt carrier group and charging handle, and you're ready to hit the range or field. It's the kind of build that rewards precision rifle discipline without forcing you to source a dozen different parts.

The upper receiver itself is forged from 7075 T6 aluminum with M4 feedramps, full-size DPMS High Profile tang geometry, and port door—all the features that define a solid mid-range .308 AR. The 16" barrel is 4150 Chrome Moly Vanadium with a QPQ corrosion-resistant finish, a 1-in-10 twist for standard .308 ammunition, and 5/8x24 threading. Mid-length gas system keeps dwell times reasonable and recoil manageable on a 16" platform. The ATLAS R-ONE handguard wraps it all with a slim, durable profile: full-length top rail for optics or lights, QD sling points at 3, 6, and 9 o'clock, and an inside diameter that pairs cleanly with low-profile gas blocks.

This is a purpose-built upper for hunters, precision shooters, and anyone running an AR-308 who values quality control and coherent engineering. The parts are matched and tested—no compatibility surprises. Just understand what you're getting: an assembled upper receiver without BCG or charging handle, so budget for those final two components to complete your rifle.

Key Features

• Factory-assembled upper receiver—no headspace guessing or gunsmith trips
• Forged 7075 T6 aluminum with DPMS High Profile tang and M4 feedramps
• 16" 4150 CMV barrel, 1-in-10 twist, QPQ finish, ready for field or range use
• Mid-length gas system for balanced recoil and reliability on a shorter platform
• ATLAS R-ONE handguard with full top picatinny rail and three QD sling attachment points
• Port door and forward assist included
• Barrel tested for chamber dimensions (MPI and HP tested)

Specifications

Frequently Asked Questions

Is this a complete upper receiver, or do I need more parts?

This is a factory-assembled complete upper: receiver, barrel, gas system, and handguard are all included and ready to install on a .308 lower receiver. You will need to supply your own bolt carrier group and charging handle to finish the build.

What .308 lower receiver is compatible with this upper?

This M5 upper is built on DPMS High Profile geometry and is compatible with AR-308 lower receivers designed for that standard. Check that your lower uses a 1-7/16 x 16 threaded takedown pin hole specification to ensure proper fit.

What kind of barrel twist does this have, and what ammunition does it stabilize?

The barrel has a 1-in-10 twist rate, which is the standard twist for modern .308 Win ammunition and will stabilize typical match-grade and hunting rounds reliably.

Can I use a suppressor or muzzle brake on this barrel?

The barrel is threaded 5/8 x 24, which is the industry standard for .308 rifles and accepts suppressors, muzzle brakes, and other muzzle devices with that threading. You will need a muzzle device of your own; none is included.