Receiver PartsAero PrecisionSold by Brownells

Aero Precision

M4e1 Complete Lower Receiver W/Moe Grip & Ubr Gen2 Carbine Stock - M4e1 Comp Lower W/Moe Grip & Ubr Gen 2 Stock For Ar-15 Blk

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

Complete Lower

Receiver for custom AR15 builds

Includes Moe

Grip and UBR Gen2 collapsible

Comes Lower

Lower parts kit, buffer, and

Integrated Ubr

Custom receiver extension tube included

M4e1 Lower

Receiver is machined from 7075-T6

$429.99
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SKU: 100049029

Overview

Built as a foundation for a custom AR-15, this complete lower receiver arrives with the lower parts kit, MOE grip, and UBR Gen2 collapsible stock already installed. It is aimed at shooters who want a ready-to-use lower assembly for a new build or upgrade without piecing together each component separately. Aero Precision describes the M4E1 receiver as an enhanced forging machined from 7075-T6 aluminum and compatible with mil-spec AR15 parts. The result is a practical setup for a serious rifle build, with the included stock and grip providing a more complete starting point than a stripped lower alone.

Why Hunters Choose the Aero Precision

Complete Lower

Receiver provides a ready base

Includes Moe

Grip and UBR Gen2 collapsible

Comes Lower

Lower parts kit, buffer, spring,

Compatible All

All mil-spec AR-15 parts

M4e1 Lower

Receiver features Aero Precision's custom

Key Features

  • Complete lower receiver for custom AR15 builds
  • Includes MOE grip and UBR Gen2 collapsible stock
  • Comes with lower parts kit, buffer, and spring
  • Integrated UBR custom receiver extension tube included
  • M4E1 lower receiver is machined from 7075-T6 aluminum
  • Compatible with all mil-spec AR15 parts

Best Used For

  • Custom AR-15 builders wanting a complete lower receiver with included grip, stock, and installed parts
  • Shooters who prefer a ready-to-assemble foundation for a personalized carbine setup
  • Users looking for an M4E1 lower compatible with mil-spec AR15 parts
  • Builders who want the M4E1 enhanced forging and integrated UBR receiver extension tube
  • Hunters and enthusiasts seeking a complete lower receiver package from Aero Precision

Specifications

Ar15 Carbine Buffer And SpringIncluded
ColorBlk
CompatibilityMil-spec AR15 parts
Grip TypeMOE Grip
Integrated Ubr Custom Receiver Extension TubeIncluded
Lower Parts KitIncluded
M4e1 Stripped Lower ReceiverIncluded
Material7075-T6 Aluminum
Moe GripIncluded
Receiver TypeComplete Lower Receiver
Stock TypeCollapsible Stock
Ubr Gen2 Collapsible StockIncluded

Pros

  • Complete lower receiver provides a ready base for a custom AR-15 build.
  • Includes MOE grip and UBR Gen2 collapsible stock already installed.
  • Comes with lower parts kit, buffer, spring, and integrated receiver extension tube.
  • Compatible with all mil-spec AR-15 parts.
  • M4E1 lower receiver features Aero Precision's custom designed enhanced forging.
  • Machined from 7075-T6 aluminum for a premium receiver foundation.

Considerations & Trade-offs

  • Complete lower receiver only; it is a base for a custom AR15 build, so additional upper components are still required.
  • The included UBR Gen2 collapsible stock and integrated receiver extension add value, but they also lock the setup into a specific stock configuration rather than a minimalist lower.
  • Compatibility is stated for mil-spec AR15 parts, so builds outside that standard may require additional verification.
  • The package is preassembled with included parts, which is convenient but leaves less room to choose each component individually.

Suggested Comparisons

  • AR-15 complete lower receivers
  • AR-15 lower receiver parts kits
  • AR-15 stocks and buffer assemblies
  • AR-15 custom build components

Suggested Accessories

  • AR-15 upper receiver
  • AR-15 magazine
  • AR-15 sling
  • AR-15 cleaning kit

Frequently Asked Questions

What parts are included with this complete lower receiver?

The listed included parts are the M4E1 stripped lower receiver, MOE grip, UBR Gen2 collapsible stock, lower parts kit, integrated UBR custom receiver extension tube, and AR15 carbine buffer and spring.

Is this lower receiver compatible with standard AR-15 parts?

Yes. The product data states that the M4E1 lower receiver is compatible with all mil-spec AR15 parts.

What material is the M4E1 lower receiver made from?

The source states that the M4E1 lower receiver is machined from 7075-T6 aluminum.

Does this come as a complete lower or do I need to assemble the main components?

It is listed as a complete lower receiver, and the included parts are described as installed.

Is this intended for a specific AR platform configuration?

The product title and description identify it as a complete lower for an AR-15 build.