Receiver PartsAero PrecisionSold by Brownells

Aero Precision

Ar-15 M4e1 Stripped Upper No Forward Assist - M4e1 5.56mm Stripped Upper No Forward Assist For Ar-15 Blk

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

Stripped M4e1

Upper receiver for AR-15 builds

No Forward

Assist provisions

Machined From

Custom 7075-T6 aluminum forgings

Compatible Mil-spec

Mil-spec AR15 components

Picatinny Profile

Enhanced and ATLAS Series handguards

$115.99
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SKU: 100049000

Overview

Built for AR-15 builders who want a stripped upper with a clean, streamlined profile, this receiver is designed around Aero Precision’s M4E1 threaded upper pattern and omits the forward assist. It is machined from custom 7075-T6 aluminum forgings and is compatible with mil-spec AR15 components, making it a practical foundation for a custom rifle setup. The Picatinny profile is intended to blend with Enhanced and ATLAS Series handguards, while the M4 feedramps and .250 takedown pin holes support standard assembly needs. For hunters and shooters planning a purpose-built carbine, it offers a straightforward starting point without extra features you may not need.

Why Hunters Choose the Aero Precision

No Forward

Assist design for a streamlined

Compatible Mil-spec

Mil-spec AR15 components

Custom 7075-t6

Aluminum forging construction

Enhanced Forging

Billet look with forged-part integrity

Picatinny Profile

Enhanced and ATLAS Series handguards

Key Features

  • Stripped M4E1 upper receiver for AR-15 builds
  • No forward assist provisions
  • Machined from custom 7075-T6 aluminum forgings
  • Compatible with mil-spec AR15 components
  • Picatinny profile designed to blend with Enhanced and ATLAS Series handguards
  • Includes M4 feedramps and .250 takedown pin holes

Best Used For

  • AR-15 builders wanting a stripped upper without forward assist provisions
  • Shooters planning a clean setup with Aero Enhanced or ATLAS Series handguards
  • Users assembling a mil-spec compatible 5.56mm AR-15 upper receiver
  • Builders who prefer the M4E1 enhanced forging look in a stripped receiver

Specifications

ColorBlk
CompatibilityMil-spec AR15 components
FeedrampsM4 Feedramps
Forward AssistNo
MaterialCustom 7075-T6 aluminum forgings
ProfilePicatinny profile
Takedown Pin Holes.250

Pros

  • No forward assist design for a streamlined upper receiver setup
  • Compatible with mil-spec AR15 components
  • Custom 7075-T6 aluminum forging construction
  • Enhanced forging provides a billet look with forged-part integrity
  • Picatinny profile blends with Enhanced and ATLAS Series handguards
  • Includes M4 feedramps and .250 takedown pin holes

Considerations & Trade-offs

  • No forward assist provision, so it’s best suited to builds where that control is intentionally omitted rather than expected as standard.
  • This is a stripped upper receiver, so it requires the remaining AR-15 components to complete the build.
  • Compatibility is stated for mil-spec AR15 components; it may not suit setups outside that specification.
  • The Picatinny profile is described as blending seamlessly with Enhanced and ATLAS Series handguards, which suggests the cleanest fit is with those handguard families.

Suggested Comparisons

  • AR-15 stripped upper receivers
  • AR-15 upper receiver assemblies
  • AR-15 handguards
  • AR-15 lower receiver parts

Suggested Accessories

  • AR-15 compatible handguard
  • Mil-spec upper receiver parts
  • AR-15 takedown pin set
  • Upper receiver vise block

Frequently Asked Questions

Does this upper receiver include a forward assist?

No. The product is specifically described as a stripped upper receiver with no forward assist provisions.

What type of AR-15 parts is this upper compatible with?

It is described as compatible with mil-spec AR15 components.

What material is the upper receiver made from?

The source states it is machined from custom 7075-T6 aluminum forgings.

What handguards does this upper pair with?

The description says its Picatinny profile blends seamlessly with Aero's Enhanced and ATLAS Series Handguards.

What other features are listed for this upper receiver?

Listed features include M4 feedramps and .250 takedown pin holes, along with the no-forward-assist design.