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M4e1 5.56mm Assembled Upper Receiver W/Atlas R-One Handguard - M4e1 5.56 Assem Upper Govt 11.5'''' Bbl Carbine Threaded Black
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$454.99
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SKU: 100036053
Overview
Built for shooters who want a ready-to-install upper with a streamlined handguard setup, this assembled unit pairs Aero Precision’s M4E1 threaded upper receiver with the ATLAS R-ONE M-LOK handguard. The design emphasizes a slim profile while still leaving room for accessory mounting, making it a practical choice for a carbine configured around 5.56mm use. It is offered in a black finish, and the included components are listed by the manufacturer as part of the assembled package. For hunters and range users who value a clean, adaptable upper without starting from individual parts, this configuration keeps the setup straightforward.
Why Hunters Choose the Aero Precision
Includes Aero
A slim profile
Atlas Attachment
System provides a durable, dependable
Handguard Design
Prioritizes size and weight without
M4e1 Threaded
Assembled upper receiver comes included
Offered Anodized
Black or Cerakote FDE depending
Key Features
- Assembled upper receiver from Aero Precision
- Includes the ATLAS R-ONE handguard with M-LOK mounting
- ATLAS attachment system is designed as a durable, dependable mounting platform
- Slim-profile handguard with room for attachment needs
- M4E1 threaded assembled upper receiver included
- Available in anodized black or Cerakote FDE depending on model
Best Used For
- Hunters building a lightweight, attachment-ready upper for a compact 5.56mm setup.
- Users who want a slim handguard profile with room for accessories and mounting options.
- Shooters looking for an assembled upper from Aero Precision with the ATLAS R-ONE system.
- Those planning a carbine-length build and prefer a threaded, black-finished upper receiver.
Specifications
| Attachment System | ATLAS attachment system |
|---|---|
| Barrel | Government 11.5" barrel |
| Barrel Threading | Threaded |
| Blade Finish | Black |
| Caliber | 5.56mm |
| Handguard | ATLAS R-ONE M-LOK Handguard |
| Handguard Length | 15" |
| Included Components | M4E1 Threaded Assembled Upper Receiver; 15" ATLAS R-ONE M-LOK Handguard |
| Receiver Finish | Anodized Black or Cerakote FDE depending on model |
| Upper Receiver | M4E1 Threaded Assembled Upper Receiver |
Pros
- Includes Aero Precision's ATLAS R-ONE handguard with a slim profile.
- ATLAS attachment system provides a durable, dependable mounting platform.
- Handguard design prioritizes size and weight without sacrificing attachment space.
- M4E1 threaded assembled upper receiver comes included.
- Offered in anodized black or Cerakote FDE depending on model.
Considerations & Trade-offs
- The ATLAS R-ONE handguard is built around a slim profile and size-conscious design, which may leave less bulk for users who prefer a fuller front end.
- The handguard is M-LOK, so accessory mounting is straightforward, but it still requires compatible M-LOK attachments.
- This assembled upper is offered in model-dependent configurations, so the included receiver finish and barrel setup should be verified before purchase.
- As an assembled upper, it is intended to be paired with a compatible lower receiver rather than used as a complete firearm.
Suggested Comparisons
- AR-15 upper receivers
- Complete upper assemblies
- Handguard-equipped rifle uppers
Suggested Accessories
- M-LOK accessories
- Optic mount
- Backup iron sights
- Weapon light
Frequently Asked Questions
What is included with this assembled upper receiver?
The listing states it includes an M4E1 threaded assembled upper receiver and a 15" ATLAS R-ONE M-LOK handguard. The description also references a 16" CMV barrel on one model variant, but the provided data is not fully clear on every configuration.
What handguard system does this upper use?
It uses Aero Precision's ATLAS R-ONE handguard with the proprietary ATLAS attachment system.
Is this upper set up for accessory mounting?
Yes. The ATLAS R-ONE handguard is described as providing plenty of real estate for attachment needs and uses an M-LOK interface.
What finish options are mentioned in the product data?
The description says the M4E1 threaded assembled upper receiver is anodized black or Cerakote FDE depending on the model.
What should I know before ordering this upper?
The provided data does not fully spell out every configuration detail, and it references more than one model variant. If you need exact barrel or finish confirmation for a specific SKU, that should be verified before purchase.