Receiver PartsAero PrecisionSold by Brownells

Aero Precision

M5 308 Winchester Assembled Upper Receiver - M5 (.308) Assem Upper Receiver 16'''' Mid-Length Threaded Blk

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

M5 Assembled

Upper receiver from Aero Precision

Includes Atlas

R-ONE handguard of choice

Aero's Proprietary

ATLAS attachment system

Includes 16-inch

Mid-length gas system

Includes Low

Profile gas block and mid-length

$599.99
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SKU: 430108696

Overview

Built for a .308 Winchester AR-10 pattern setup, this assembled upper is a ready-to-install option for hunters and shooters who want a complete upper without piecing together the major components. It includes an M5 assembled upper receiver, ATLAS R-ONE handguard, 16" .308 CMV barrel with mid-length gas system, plus a low-profile gas block and gas tube. The handguard is designed to keep the profile slim while still leaving room for accessories, making it a practical choice for a field rifle or a general-purpose hunting build. A BCG and charging handle are not included, so those parts must be selected separately.

Why Hunters Choose the Aero Precision

Includes Assembled

M5 upper receiver for a

Atlas R-one

Handguard offers a slim profile

Handguard Design

Balances size and weight considerations

Comes 16-inch

A 16-inch .308 CMV barrel

Includes Low-profile

Gas block and mid-length gas

Key Features

  • M5 assembled upper receiver from Aero Precision
  • Includes ATLAS R-ONE handguard of choice
  • Features Aero's proprietary ATLAS attachment system
  • Includes 16-inch .308 CMV barrel with mid-length gas system
  • Includes low profile gas block and mid-length gas tube
  • Product comes assembled; BCG and charging handle not included

Best Used For

  • Hunters building a .308 upper with a slim, attachment-ready handguard setup
  • Shooters wanting a complete assembled upper without a BCG or charging handle
  • Users who prefer a mid-length gas system and low-profile gas block configuration
  • Field and range users needing a compact 16-inch .308 upper receiver assembly

Specifications

Atlas R One HandguardIncluded
Barrel Length16"
Barrel MaterialCMV
Bcg IncludedNo
Caliber.308
Charging Handle IncludedNo
Gas SystemMid-Length
Handguard Of ChoiceIncluded
Low Profile Gas BlockIncluded
M5 Assembled Upper ReceiverIncluded
Mid Length Gas TubeIncluded
Product Comes AssembledYes

Pros

  • Includes an assembled M5 upper receiver for a ready-to-build platform.
  • ATLAS R-ONE handguard offers a slim profile with attachment space.
  • Handguard design balances size and weight considerations.
  • Comes with a 16-inch .308 CMV barrel and mid-length gas system.
  • Includes low-profile gas block and mid-length gas tube.
  • Complete upper arrives assembled, excluding BCG and charging handle.

Considerations & Trade-offs

  • This is a complete upper, but it does not include a BCG or charging handle, so those components must be selected separately.
  • The 16" .308 CMV barrel and mid-length gas setup are fixed as listed, which limits flexibility if you are building around a different barrel length or gas system.
  • The ATLAS R-ONE handguard is designed with size and weight in mind, so it favors a slim profile over a more substantial front-end feel.
  • The handguard offers attachment real estate, but the product details do not specify included accessories or mounting hardware beyond the assembled upper components.

Suggested Comparisons

  • AR-10 / .308 complete upper receivers
  • Free-float handguards
  • .308 barrels
  • Upper receiver assemblies

Suggested Accessories

  • Rifle scope mount
  • Backup iron sights
  • Charging handle
  • Bolt carrier group

Frequently Asked Questions

What comes included with this assembled upper receiver?

It includes the M5 Assembled Upper Receiver, an ATLAS R-ONE Handguard, a 16" .308 CMV barrel with mid-length gas system, a low profile gas block, and a mid-length gas tube. It comes assembled.

Does this complete upper include a bolt carrier group or charging handle?

No. The source data states that this complete upper does not include a BCG or charging handle.

What caliber is this upper built for?

The product title and included barrel specification identify it as a .308 Winchester / .308 upper.

What handguard system does it use?

It uses Aero Precision's ATLAS R-ONE handguard with the proprietary ATLAS attachment system.

Is the handguard described as bulky or streamlined?

The description says the R-ONE handguard is designed with size and weight in mind and maintains a slim profile while still providing attachment space.