Receiver PartsAero PrecisionSold by Brownells

Aero Precision

Aero Ar-15 Assembled Upper 5.56mm Build Kits - Build Kit 5.56mm Assembled Upper 16'''' Mid-Length 12'''' Hg Black

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

Includes Aero

Forward assist and ejection port

Laser-engraved T-marks

On the Picatinny rail

Uses M4-type

M4 feed cuts inside

Includes Three

Core upper components: receiver, barrel,

Configured As

5.56mm assembled upper build kit

$462.29
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SKU: 100042978

Overview

This upper bundle is designed for hunters and rifle builders who want a focused starting point for a custom AR-15 setup without paying for parts they do not plan to use. It includes the core components needed to move a build forward: an assembled upper receiver, barrel, and extended M-LOKA handguard, with the forward assist and ejection port cover already installed. The flattop, M4-type receiver also features laser-engraved T-marks on the Picatinny rail and M4 feed cuts inside. It is a practical option for a 5.56mm build where the goal is to assemble the rest of the upper around selected components.

Why Hunters Choose the Aero Precision

Includes Three

Core upper components for a

Mil-spec, Flattop

Forward assist and ejection port

Laser-engraved T-marks

On the Picatinny rail support

M4 Feed

Cuts are built into the

Lets You

Choose the remaining components separately,

Key Features

  • Includes Aero Precision mil-spec, flattop, M4-type upper receiver with forward assist and ejection port cover installed.
  • Features laser-engraved T-marks on the Picatinny rail.
  • Uses an M4-type upper receiver with M4 feed cuts inside.
  • Includes the three core upper components: receiver, barrel, and extended M-LOK handguard.
  • Configured as a 5.56mm assembled upper build kit.
  • Listed with a 16-inch mid-length upper and 12-inch handguard in black.

Best Used For

  • For hunters building a custom AR-15 upper around their preferred remaining components.
  • For shooters who want an assembled upper with forward assist and ejection port cover already installed.
  • For users planning a lightweight parts-by-parts build without buying a complete rifle.
  • For those wanting an upper bundle with an extended M-LOKA handguard and flattop receiver.
  • For builders who prefer a straightforward 5.56mm mid-length upper starting point.

Specifications

BarrelIncluded
Barrel Length16"
Build TypeBuild Kit
Caliber5.56mm
Ejection Port CoverInstalled
Forward AssistInstalled
Gas SystemMid-Length
HandguardIncluded
Handguard ColorBlack
Handguard Length12"
M4 Feed CutsPresent
M Lok HandguardExtended M-LOKA(R) handguard
Picatinny RailPresent
ReceiverIncluded
Receiver Typemil-spec, flattop, M4-type upper receiver
T MarksLaser-engraved
Upper TypeAssembled Upper

Pros

  • Includes the three core upper components for a custom build: receiver, barrel, and extended handguard.
  • Mil-spec, flattop M4-type upper receiver comes with forward assist and ejection port cover installed.
  • Laser-engraved T-marks on the Picatinny rail support consistent accessory placement.
  • M4 feed cuts are built into the upper receiver.
  • Lets you choose the remaining components separately, reducing unused parts.

Considerations & Trade-offs

  • This is an upper bundle, not a complete rifle, so additional components are still required to finish the build.
  • The package is centered on the upper receiver, barrel, and extended M-LOKA handguard; it does not include the rest of the rifle system.
  • The mil-spec, flattop M4-type receiver and Picatinny rail layout are purpose-built for a compatible build, so fitment depends on the parts selected to complete the upper.
  • The description emphasizes reduced leftover parts, which is useful for custom builds but means you are committing to a more selective parts list up front.

Suggested Comparisons

  • AR-15 upper receiver assemblies
  • AR-15 build kits
  • 5.56mm upper receiver groups
  • AR-15 handguard and receiver component kits

Suggested Accessories

  • Upper receiver parts kit
  • AR-15 lower receiver
  • Optic mount
  • Backup iron sights

Frequently Asked Questions

What comes included in this Aero Precision AR-15 upper build kit?

The product description says the bundle includes three core components: the receiver, barrel, and an extended M-LOK handguard. It also states the upper receiver comes with the forward assist and ejection port cover already installed.

Is this a complete rifle or just an upper assembly package?

This is an upper build kit, not a complete rifle. The description says it is intended for building a custom rifle upper, with the remaining components purchased separately.

What type of upper receiver is included?

The description identifies it as Aero's mil-spec, flattop, M4-type upper receiver with laser-engraved T-marks on the Picatinny rail.

Does the product description specify the barrel details?

The title identifies it as a 5.56mm build kit with a 16-inch mid-length upper, but the provided data does not list additional barrel specifications.

What handguard style is mentioned?

The long description says the bundle includes an extended M-LOK handguard. No further handguard specifications are provided in the source data.