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M4e1 Upper Receivers Complete .300 Blackout - M4e1 300blk Assm Upper Gov 10''''bbl Pistol-Length Threaded Blk
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$554.99
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SKU: 100054454
Overview
Built around Aero Precision’s M4E1 threaded assembled upper receiver, this complete upper is configured for .300 Blackout builds and pairs with the ATLAS S-ONE handguard for a slim, lightweight setup. The M-LOK handguard and proprietary ATLAS attachment system provide a secure mounting platform while keeping the profile streamlined for a practical hunting or field rifle. With barrel and handguard length options listed in the product data, it can be matched to different build preferences without changing the core purpose of the upper. This is a focused choice for shooters looking to assemble a compact .300 Blackout upper with a modern, modular layout.
Why Hunters Choose the Aero Precision
Complete Upper
Includes Aero Precision's ATLAS S-ONE
Slim-profile Handguard
Size and weight in mind
Proprietary Atlas
Attachment system provides a durable
M4e1 Threaded
Assembled upper receiver is included
Offered 10-inch
A 10-inch .300 Blackout CMV
Key Features
- Complete upper receiver from Aero Precision for .300 Blackout builds.
- Includes the M4E1 threaded assembled upper receiver.
- Features the ATLAS S-ONE handguard with a slim profile.
- ATLAS attachment system is described as durable and dependable.
- Offered with 7-inch, 9-inch, or 12-inch M-LOK handguard options.
- Configured with .300 Blackout CMV barrel options in the listing.
Best Used For
- Hunters building a lightweight .300 Blackout upper with a slim-profile handguard
- Users wanting a complete upper receiver for a compact, threaded .300 Blackout setup
- Shooters prioritizing a durable mounting platform with a minimal front-end feel
- Owners planning an Aero Precision-based build around M-LOK accessory compatibility
Specifications
| Barrel | 10" .300 Blackout CMV Barrel |
|---|---|
| Barrel Length | 10" |
| Blade Finish | Blk |
| Caliber | .300 Blackout |
| Gas System | Pistol-Length |
| Handguard | ATLAS S-ONE Handguard |
| Handguard Attachment System | ATLAS attachment system |
| Handguard Length | 9" M-LOK ATLAS S-ONE Handguard |
| M Lok | Yes |
| Threaded | Yes |
| Upper Receiver | M4E1 Threaded Assembled Upper Receiver |
Pros
- Complete upper includes Aero Precision's ATLAS S-ONE handguard.
- Slim-profile handguard is designed with size and weight in mind.
- Proprietary ATLAS attachment system provides a durable mounting platform.
- M4E1 threaded assembled upper receiver is included.
- Offered with a 10-inch .300 Blackout CMV barrel configuration.
Considerations & Trade-offs
- This is a complete upper, so it is intended for builders who already have the rest of the rifle setup in mind rather than a standalone purchase.
- The ATLAS S-ONE handguard is presented as slim and lightweight, which supports a compact build but may leave less exterior surface area than a bulkier handguard.
- The product listing references multiple handguard and barrel length combinations, so buyers should verify the exact configuration before ordering.
- The description does not provide details on included accessories beyond the upper assembly, so any additional components may need to be sourced separately.
Suggested Comparisons
- AR-15 complete upper receivers
- .300 Blackout upper assemblies
- Lightweight handguard upper builds
- Pistol-length upper configurations
Suggested Accessories
- M-LOK rail accessories
- Weapon light mount
- Sling
- Optic mount
Frequently Asked Questions
What is included with this complete upper receiver assembly?
The listing says it includes Aero Precision’s M4E1 threaded assembled upper receiver and the ATLAS S-ONE handguard. The description also references .300 Blackout CMV barrel and handguard length options, but the provided data is truncated before the full configuration details are shown.
Is this upper chambered for .300 Blackout?
Yes. The product title and description identify it as a .300 Blackout upper receiver assembly.
What handguard system does this upper use?
It uses Aero Precision’s ATLAS S-ONE handguard with the proprietary ATLAS attachment system, described as a slim-profile mounting platform.
Is this upper intended for a lightweight build?
Yes. The description says the S-ONE handguards are designed with size and weight in mind and are intended as a fit for a lightweight build.
Are the exact barrel and handguard configuration details fully shown in the provided data?
No. The source data mentions multiple configuration options, but the long description is cut off before all of them are fully listed.