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 .300 BO ASSEMBL UPPR RCVR M4 10" BBL PISTOL-LENGTH BLK Support

The Aero Precision M4E1 .300 Blackout Upper offers customizable lengths, M-LOK handguards, and a pistol-length gas system for enhanced tactical performance.

AERO PRECISION M4E1 .300 BO ASSEMBL UPPR RCVR M4 10" BBL PISTOL-LENGTH BLK

815421022674 100025513

Filters:

Variations
Filters:
Variations:

Variations:

The Aero Precision M4E1 .300 Blackout Upper offers customizable lengths, M-LOK handguards, and a pistol-length gas system for enhanced tactical performance.
M4E1 ASSEMBLED UPPER RECEIVER .300 BLACKOUT BLACK - M4E1 .300 BO ASSEMBL UPPR RCVR M4 10" BBL PISTOL-LENGTH BLK
739.9 GBP 0 £739.90 *
Not available
Cartridge: 300 AAC Blackout Color: Black Contour: M4 Finish: Anodized Length: 10'' Make: AR-15 Style: Assembled Twist: 1-7 Product no.: 100025513
Not available
739.9 GBP 0 £739.90 *
The Aero Precision M4E1 .300 Blackout Upper Receiver offers a customizable AR build with various barrel lengths, M-LOK handguards, and a sleek black finish.
M4E1 ASSEMBLED UPPER RECEIVER .300 BLACKOUT BLACK - M4E1 .300 BO ASSEMBL UPPER RCVR M4 8" BBL PISTOL-LENGTH BLK
719.9 GBP 0 £719.90 *
Not available
Cartridge: 300 AAC Blackout Color: Black Contour: M4 Finish: Anodized Length: 8'' Make: AR-15 Style: Assembled Twist: 1-7 Product no.: 100025512
Not available
719.9 GBP 0 £719.90 *
The Aero Precision M4E1 .300 Blackout Upper Receiver offers customizable lengths, M-LOK handguards, and a pistol-length gas system for enhanced performance.
M4E1 ASSEMBLED UPPER RECEIVER .300 BLACKOUT BLACK - M4E1 .300 BO ASSEMBL UPPR RCVR M4 16" BBL PISTOL-LENGTH BLK
799.9 GBP 0 £799.90 *
Not available
Cartridge: 300 AAC Blackout Color: Black Contour: M4 Finish: Anodized Length: 16'' Make: AR-15 Style: Assembled Twist: 1-7 Product no.: 100025514
Not available
799.9 GBP 0 £799.90 *
719.9 799.9 3 GBP
739.9 GBP £739.90

Prices inclusive of duty & VAT.

Product no.: 100025513

Mfr. No.: APAR640221M4

815421022674 From Aero Precision, the AR-15 M4E1 .300 Blackout Assembled Upper Receivers. Chambered in 300 Blackout, the upper is finished with black anodizing and available in three lengths, each with different length handguards. This upper does not come with the charging handle or bolt carrier group, allowing the user to personalize their upper receiver even more! The Aero Precision Assembled Upper Receiver also features: M-LOK EM-7 7” for 8” barrel, 9” handguard for 10” barrel, 15” handguard for 16” barrel 8”, 10”, and 16” carbine length chrome moly barrel Pistol length gas system w/ low profile gas block Standard A2 flash hider - not pinned or welded Bolt Carrier Group and Charging Handle are NOT included Made in the USA The Aero Precision AR-15 8", 10", or 16” Assembled Upper Receiver is a great choice for your next AR-15 build! The flash hider that comes with this complete 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.
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
719.9 799.9 3 GBP
Description Specification Customers reviews Accessories

AERO PRECISION M4E1 .300 BO ASSEMBL UPPR RCVR M4 10" BBL PISTOL-LENGTH BLK

739.9 GBP £739.90

Prices inclusive of duty & VAT.

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

Description:

Elevate your AR-15 build with the M4E1 Assembled Upper Receiver!

From Aero Precision, the AR-15 M4E1 .300 Blackout Assembled Upper Receivers offer versatility and customization for your firearm needs. Chambered in .300 Blackout, this upper features a sleek black anodized finish and is available in three lengths, each paired with different handguard options.

Key Features:

  • M-LOK EM-7 7” handguard for 8” barrel
  • 9” handguard for 10” barrel
  • 15” handguard for 16” barrel
  • 8”, 10”, and 16” carbine length chrome moly barrel
  • Pistol length gas system with low profile gas block
  • Standard A2 flash hider – not pinned or welded
  • Note: Bolt Carrier Group and Charging Handle are NOT included
  • Made in the USA

The Aero Precision AR-15 8", 10", or 16” Assembled Upper Receiver is an excellent choice for your next AR-15 build! Please note that the flash hider included with this complete upper receiver is NOT pinned nor welded to the barrel. According to the National Firearms Act, the muzzle brake MUST be pinned and welded to comply with the necessary 16" requirement as defined by the ATF for a rifle build.



Restrictions

  • Is a 'Call to order' product.

Top takeaways

  1. The Aero Precision M4E1 Assembled Upper Receiver is chambered in .300 Blackout and comes in three barrel lengths with corresponding handguards but does not include a bolt carrier group or charging handle.
  2. It features a pistol-length gas system, standard A2 flash hider, and is made in the USA with a black anodized finish.
  3. The upper receiver requires the flash hider to be pinned and welded for rifle builds to comply with the National Firearms Act.

Attributes

  • Cartridge: 
    300 AAC Blackout
  • Colour: 
    Black
  • Contour: 
    M4
  • Finish: 
    Anodized
  • Length: 
    10''
  • Style: 
    Assembled
  • Twist: 
    1-7
  • Weapon type: 
    AR-15
  • Delivery weight: 1.52kg
  • Shipping height: 108mm
  • Shipping width: 114mm
  • Shipping length: 625mm
  • UPC: 815421022674

Item details

Made in USA
US export classification: I(g)

Customers reviews

Customer ratings (0)

0 / 5

Variations:

The Aero Precision M4E1 .300 Blackout Upper offers customizable lengths, M-LOK handguards, and a pistol-length gas system for enhanced tactical performance.
M4E1 ASSEMBLED UPPER RECEIVER .300 BLACKOUT BLACK - M4E1 .300 BO ASSEMBL UPPR RCVR M4 10" BBL PISTOL-LENGTH BLK
739.9 GBP 0 £739.90 *
Not available
Cartridge: 300 AAC Blackout Color: Black Contour: M4 Finish: Anodized Length: 10'' Make: AR-15 Style: Assembled Twist: 1-7 Product no.: 100025513
Not available
739.9 GBP 0 £739.90 *
The Aero Precision M4E1 .300 Blackout Upper Receiver offers a customizable AR build with various barrel lengths, M-LOK handguards, and a sleek black finish.
M4E1 ASSEMBLED UPPER RECEIVER .300 BLACKOUT BLACK - M4E1 .300 BO ASSEMBL UPPER RCVR M4 8" BBL PISTOL-LENGTH BLK
719.9 GBP 0 £719.90 *
Not available
Cartridge: 300 AAC Blackout Color: Black Contour: M4 Finish: Anodized Length: 8'' Make: AR-15 Style: Assembled Twist: 1-7 Product no.: 100025512
Not available
719.9 GBP 0 £719.90 *
The Aero Precision M4E1 .300 Blackout Upper Receiver offers customizable lengths, M-LOK handguards, and a pistol-length gas system for enhanced performance.
M4E1 ASSEMBLED UPPER RECEIVER .300 BLACKOUT BLACK - M4E1 .300 BO ASSEMBL UPPR RCVR M4 16" BBL PISTOL-LENGTH BLK
799.9 GBP 0 £799.90 *
Not available
Cartridge: 300 AAC Blackout Color: Black Contour: M4 Finish: Anodized Length: 16'' Make: AR-15 Style: Assembled Twist: 1-7 Product no.: 100025514
Not available
799.9 GBP 0 £799.90 *

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