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AeroPrecision
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.
| Caliber | .308 Win / 7.62×51 NATO |
| Barrel Length | 16" |
| Barrel Material | 4150 Chrome Moly Vanadium |
| Barrel Finish | QPQ Corrosion Resistant |
| Barrel Twist | 1 in 10 |
| Barrel Threading | 5/8 x 24 |
| Barrel Weight | 36 oz |
| Gas Block Journal | .750" |
| Gas System Length | Mid-Length |
| Barrel Extension | DPMS HP |
| Upper Receiver Material | 7075 T6 Aluminum (Forged) |
| Feedramps | M4 Style |
| Rail System | ATLAS R-ONE |
| Handguard Inside Diameter | 1.5" |
| Handguard Outside Diameter | 1.75" |
| QD Sling Sockets | 3, 6, 9 o'clock positions |
| Takedown Pin Holes | .2795" |
| Included Components | M5 Assembled Upper Receiver, ATLAS R-ONE Handguard, 16" Barrel, Low Profile Gas Block, Mid-Length Gas Tube, Port Door, Forward Assist |
| Not Included | Bolt Carrier Group (BCG), Charging Handle |
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.
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.
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.
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.
AeroPrecision
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.
| Caliber | .308 Win / 7.62×51 NATO |
| Barrel Length | 16" |
| Barrel Material | 4150 Chrome Moly Vanadium |
| Barrel Finish | QPQ Corrosion Resistant |
| Barrel Twist | 1 in 10 |
| Barrel Threading | 5/8 x 24 |
| Barrel Weight | 36 oz |
| Gas Block Journal | .750" |
| Gas System Length | Mid-Length |
| Barrel Extension | DPMS HP |
| Upper Receiver Material | 7075 T6 Aluminum (Forged) |
| Feedramps | M4 Style |
| Rail System | ATLAS R-ONE |
| Handguard Inside Diameter | 1.5" |
| Handguard Outside Diameter | 1.75" |
| QD Sling Sockets | 3, 6, 9 o'clock positions |
| Takedown Pin Holes | .2795" |
| Included Components | M5 Assembled Upper Receiver, ATLAS R-ONE Handguard, 16" Barrel, Low Profile Gas Block, Mid-Length Gas Tube, Port Door, Forward Assist |
| Not Included | Bolt Carrier Group (BCG), Charging Handle |
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.
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.
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.
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.
