Receiver PartsAero PrecisionSold by Brownells

Aero Precision

M5e1 308 Winchester Assembled Upper Receiver W/Gen 2 Handguard - M5e1 308 Win Assembled Upper Fluted 18'''' Rifle Length Fde

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

Assembled M5e1

Gen 2 Enhanced Handguard

Includes 15-inch

Quick disconnect sling sockets

Enhanced Milling

Design and a new-profile Picatinny

Includes Low

Profile gas block and rifle-length

Supplied .308

A .308 A2 birdcage flash

$799.99
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SKU: 430103914

Overview

Built for a .308 Winchester AR-style setup, this assembled upper receiver is aimed at hunters and shooters who want a ready-to-build foundation with the handguard and gas system already in place. It includes Aero Precision’s Gen 2 Enhanced Handguard with quick disconnect sling sockets, an enhanced milling design, and a revised top rail profile for a clean, functional layout. The package also comes with a low profile gas block, rifle-length gas tube, and .308 A2 birdcage flash hider, while leaving the BCG and charging handle to the builder. Forged from 7075 T6 aluminum, it offers a practical starting point for a serious rifle build without adding unnecessary extras.

Why Hunters Choose the Aero Precision

Includes Aero

Quick disconnect sling sockets

15-inch Enhanced

M-LOK handguard provides ample accessory

Comes Assembled,

Simplifying setup for compatible builds

Includes Low

Profile gas block and rifle-length

Forged From

7075 T6 aluminum for the

Key Features

  • Assembled M5E1 .308 Winchester upper receiver with Gen 2 Enhanced Handguard
  • Includes 15-inch Enhanced M-LOK handguard with quick disconnect sling sockets
  • Features enhanced milling design and a new-profile Picatinny top rail
  • Includes low profile gas block and rifle-length gas tube
  • Supplied with a .308 A2 birdcage flash hider
  • Does not include BCG or charging handle
  • Forged from 7075 T6 aluminum

Best Used For

  • Hunters building a .308 Winchester rifle around an assembled upper receiver package
  • Users wanting a rifle-length upper with included handguard, gas system, and flash hider
  • Shooters who prefer a 15-inch M-LOK handguard with quick disconnect sling sockets
  • Builders who already have a BCG and charging handle for a complete setup
  • Those seeking an Aero Precision upper with a forged 7075 T6 aluminum receiver

Specifications

AssembledYes
Caliber308 Winchester
ColorFDE
Enhanced Milling DesignYes
Flash Hider.308 A2 Birdcage Flash Hider
Gas BlockLow Profile Gas Block
Gas TubeRifle Length Gas Tube
Handguard15" Enhanced M-LOK Handguard
Includes BcgNo
Includes Charging HandleNo
Material7075 T6 aluminum
Picatinny Top RailNew profile
Quick Disconnect Sling SocketsYes
Upper ReceiverM5E1 Enhanced Assembled Upper Receiver

Pros

  • Includes Aero Precision’s Gen 2 Enhanced Handguard with quick disconnect sling sockets.
  • 15-inch Enhanced M-LOK handguard provides ample accessory mounting space.
  • Comes assembled, simplifying setup for compatible builds.
  • Includes low profile gas block and rifle-length gas tube.
  • Forged from 7075 T6 aluminum for the upper receiver.
  • .308 A2 birdcage flash hider is included.

Considerations & Trade-offs

  • Does not include a BCG or charging handle, so those components must be selected separately.
  • The 15" enhanced M-LOK handguard is part of the assembled upper, which may require checking compatibility with your intended setup before purchase.
  • The package is built around a rifle-length gas tube and low-profile gas block, so it is a more specific configuration rather than a blank upper for custom part selection.

Suggested Comparisons

  • AR-10 / .308 Winchester upper receivers
  • Complete upper receiver assemblies
  • M-LOK handguard-equipped uppers
  • AR-10 build components

Suggested Accessories

  • Bolt carrier group
  • Charging handle
  • Sling
  • Magazine

Frequently Asked Questions

What is included with this assembled upper receiver?

The product includes the M5E1 Enhanced Assembled Upper Receiver, a 15" Enhanced M-LOK Handguard, a low profile gas block, a rifle length gas tube, and a .308 A2 Birdcage Flash Hider.

Does this upper come fully assembled?

Yes. The product description states that it comes assembled.

Are the bolt carrier group and charging handle included?

No. The description specifically says this assembled upper does not include a BCG or charging handle.

What handguard features are listed for this upper?

The Gen 2 Enhanced Handguard is described as having quick disconnect sling sockets, enhanced milling design for grip and visual appeal, and a new profile for the Picatinny top rail.

What material is the upper receiver forged from?

The M5E1 upper features are listed as forged from 7075 T6 aluminum.