My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Wish list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Rifle Parts Receiver Parts Receivers Upper Receivers AERO PRECISION M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED FDE Support

The Aero Precision M4E1 5.56MM Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging for a billet look, and is compatible with various barrel lengths.

AERO PRECISION M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED FDE

815421027778 100036054

Filters:

Variations
Filters:
Variations:

Variations:

The Aero Precision M4E1 5.56MM Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging for a billet look, and is compatible with various barrel lengths.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED FDE
619.9 GBP 0 £619.90 *
Not available
Cartridge: 5.56 mm NATO Color: Flat Dark Earth Contour: Government Finish: Anodized Length: 11.5'' Make: AR-15 Style: Complete Product no.: 100036054
Not available
619.9 GBP 0 £619.90 *
The Aero Precision M4E1 Upper Receiver features a lightweight ATLAS R-ONE Handguard, enhanced forging, and compatibility with various barrel lengths for versatile performance.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED BLACK
589.9 GBP 0 £589.90 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: Government Finish: Anodized Length: 11.5'' Make: AR-15 Style: Complete Product no.: 100036053
Not available
589.9 GBP 0 £589.90 *
The Aero Precision M4E1 Upper Receiver features an ATLAS R-ONE Handguard, durable construction, and compatibility with various barrel lengths for versatile performance.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEMBLD UPPER M4 16" BBL MID-LENGTH THREADED BLK
813.9 GBP 0 £813.90 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: CMV Finish: Anodized Length: 16'' Make: AR-15 Style: Complete Twist: 1-7 Product no.: 100054460
Not available
813.9 GBP 0 £813.90 *
The Aero Precision M4E1 5.56MM Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging, and compatibility with various barrel lengths for optimal performance.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEMBLED UPPER GOVT 18" BBL RIFLE THREADED BLACK
832.6 GBP 0 £832.60 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: CMV Finish: Anodized Length: 18'' Make: AR-15 Style: Complete Twist: 1-7 Product no.: 100054461
Not available
832.6 GBP 0 £832.60 *
The Aero Precision M4E1 Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging for a sleek look, and compatibility with various barrel lengths.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEM UPPER GOVT 14.5" BBL MID-LENGTH THREADED BLK
776.4 GBP 0 £776.40 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: Government Finish: Anodized Length: 12'' Make: AR-15 Style: Complete Product no.: 100042527
Not available
776.4 GBP 0 £776.40 *
589.9 832.6 5 GBP
619.9 GBP £619.90

Prices inclusive of duty & VAT.

Product no.: 100036054

Mfr. No.: APAR700712M29

815421027778 This assembled upper includes Aero Precision’s new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Their proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. INCLUDES: M4E1 Threaded Assembled Upper Receiver - Anodized Black or Cerakote FDE depending on model. 15" ATLAS R-ONE M-LOK Handguard with 16"CMV Barrel OR 15" ATLAS R-ONE M-LOK Handguard 18" Rifle Length CMV Barrel OR 10” ATLAS R-ONE M-LOK Handguard 10.5” Carbine Length M4 Barrel Low Profile Gas Block and Mid Pencil, Mid-Length, or Rifle Length Gas Tube depending on configuration Product comes assembled This assembled upper does not include BCG or Charging Handle. The muzzle brake that comes with this assembled upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16"" as defined by the ATF for a rifle build. M4E1 Threaded Upper Receiver Features: New enhanced forging that gives the upper receiver a "billet look" New picatinny profile that blends seamlessly with our Enhanced Series Handguards M4 Feedramps .250 takedown pin holes Laser engraved T-marks Includes port door and forward assist installed ATLAS R-ONE Handguard Features: Full top picatinny rail for optional attachments Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Compatible with low profile gas blocks 1.3 Inside diameter 1.5 Outside diameter Compatible with mil-spec AR15 upper receivers and barrels 10” and 11.5 ” Carbine Length Barrel Features 5.56 Nato, carbine gas system, 1/7 twist, 4150 CrMoV QPQ .750 gas block journal Carbine gas system .0785" gas port M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider 14.5” and 16" Mid-Length Barrel Features: Mid-length, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled .750 gas block journal Mid-length gas system, .0785 gas port M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider 16" Mid-Length Barrel Features: 16" Mid-length, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled .750 gas block journal Mid-length gas system, .0785 gas port M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider 18" Rifle Length Barrel Features: 18" Rifle Length Barrel 4150 CrMoV w/ QPQ finish 1/7 twist .750 gas block journal Rifle length gas system M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider
Not available
Be the first to rate this product

Not available.

100-Day Return Policy
No charges until we ship
No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.
Wish List Ask question
order by phone
589.9 832.6 5 GBP
Description Specification Customers reviews Accessories

AERO PRECISION M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED FDE

619.9 GBP £619.90

Prices inclusive of duty & VAT.

Is a 'Call to order' product.
Requires order by phone

Description:

Introducing the M4E1 5.56MM Assembled Upper Receiver with ATLAS R-ONE Handguard!

This assembled upper receiver from Aero Precision features the innovative ATLAS R-ONE Handguard, designed with both size and weight in mind while offering ample space for attachments tailored to your needs.

The proprietary ATLAS attachment system provides a robust and reliable mounting platform, maintaining a slim profile without compromising on strength and stability, which Aero Precision handguards are renowned for.

Included Components:

  • M4E1 Threaded Assembled Upper Receiver - Available in Anodized Black or Cerakote FDE depending on model.
  • 15" ATLAS R-ONE M-LOK Handguard with 16" CMV Barrel OR
  • 15" ATLAS R-ONE M-LOK Handguard with 18" Rifle Length CMV Barrel OR
  • 10” ATLAS R-ONE M-LOK Handguard with 10.5” Carbine Length M4 Barrel
  • Low Profile Gas Block and Mid Pencil, Mid-Length, or Rifle Length Gas Tube depending on configuration
  • Product comes fully assembled

Please note: This assembled upper does not include BCG or Charging Handle. The muzzle brake included is NOT pinned nor welded to the barrel. According to the National Firearms Act, the muzzle brake MUST be pinned and welded to meet the required 16" as defined by the ATF for a rifle build.

M4E1 Threaded Upper Receiver Features:

  • New enhanced forging for a "billet look"
  • New picatinny profile that integrates seamlessly with Enhanced Series Handguards
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes port door and forward assist installed

ATLAS R-ONE Handguard Features:

  • Full top picatinny rail for optional attachments
  • Quick disconnect sling socket at the 3, 6, and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.3" Inside diameter
  • 1.5" Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels

Barrel Options:

10” and 11.5” Carbine Length Barrel Features:

  • 5.56 NATO, carbine gas system, 1/7 twist, 4150 CrMoV QPQ
  • .750 gas block journal
  • Carbine gas system .0785" gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

14.5” and 16" Mid-Length Barrel Features:

  • Mid-length, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-length gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

18" Rifle Length Barrel Features:

  • 18" Rifle Length Barrel
  • 4150 CrMoV with QPQ finish
  • 1/7 twist
  • .750 gas block journal
  • Rifle length gas system
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider


Restrictions

  • Is a 'Call to order' product.

Top takeaways

  1. The M4E1-T ATLAS R-ONE Complete Upper Receiver features a lightweight design with the new ATLAS R-ONE Handguard and enhanced forging for a billet look.
  2. This upper receiver does not include a BCG or Charging Handle and comes with a 5.56 CMV Barrel that is available in 11.5" carbine length or 14.5" mid-length options.
  3. Aero Precision's upper includes M4 feedramps, .250 takedown pin holes, a standard A2 flash hider, and is HP and MPI tested for quality assurance.

Attributes

  • Cartridge: 
    5.56 mm NATO
  • Colour: 
    Flat Dark Earth
  • Contour: 
    Government
  • Finish: 
    Anodized
  • Length: 
    11.5''
  • Style: 
    Complete
  • Twist: -
  • Weapon type: 
    AR-15
  • Delivery weight: 1.597kg
  • Shipping height: 102mm
  • Shipping width: 102mm
  • Shipping length: 597mm
  • UPC: 815421027778

Item details

Made in USA
US export classification: I(g)

Customers reviews

Customer ratings (0)

0 / 5

Variations:

The Aero Precision M4E1 5.56MM Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging for a billet look, and is compatible with various barrel lengths.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED FDE
619.9 GBP 0 £619.90 *
Not available
Cartridge: 5.56 mm NATO Color: Flat Dark Earth Contour: Government Finish: Anodized Length: 11.5'' Make: AR-15 Style: Complete Product no.: 100036054
Not available
619.9 GBP 0 £619.90 *
The Aero Precision M4E1 Upper Receiver features a lightweight ATLAS R-ONE Handguard, enhanced forging, and compatibility with various barrel lengths for versatile performance.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEM UPPER GOVT 11.5" BBL CARBINE THREADED BLACK
589.9 GBP 0 £589.90 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: Government Finish: Anodized Length: 11.5'' Make: AR-15 Style: Complete Product no.: 100036053
Not available
589.9 GBP 0 £589.90 *
The Aero Precision M4E1 Upper Receiver features an ATLAS R-ONE Handguard, durable construction, and compatibility with various barrel lengths for versatile performance.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEMBLD UPPER M4 16" BBL MID-LENGTH THREADED BLK
813.9 GBP 0 £813.90 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: CMV Finish: Anodized Length: 16'' Make: AR-15 Style: Complete Twist: 1-7 Product no.: 100054460
Not available
813.9 GBP 0 £813.90 *
The Aero Precision M4E1 5.56MM Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging, and compatibility with various barrel lengths for optimal performance.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEMBLED UPPER GOVT 18" BBL RIFLE THREADED BLACK
832.6 GBP 0 £832.60 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: CMV Finish: Anodized Length: 18'' Make: AR-15 Style: Complete Twist: 1-7 Product no.: 100054461
Not available
832.6 GBP 0 £832.60 *
The Aero Precision M4E1 Upper features a lightweight ATLAS R-ONE Handguard, enhanced forging for a sleek look, and compatibility with various barrel lengths.
M4E1 5.56MM ASSEMBLED UPPER RECEIVER W/ATLAS R-ONE HANDGUARD - M4E1 5.56 ASSEM UPPER GOVT 14.5" BBL MID-LENGTH THREADED BLK
776.4 GBP 0 £776.40 *
Not available
Cartridge: 5.56 mm NATO Color: Black Contour: Government Finish: Anodized Length: 12'' Make: AR-15 Style: Complete Product no.: 100042527
Not available
776.4 GBP 0 £776.40 *

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top