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M4e1 5.56 Assembled Upper Receiver W/M-Lok Atlas S-One Handguard - M4e1 5.56 Assm Uppr 11.5'''' Carbine 9'''' Atlas S-One Hg Fde
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$484.99
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SKU: 100036052
Overview
Built around Aero Precision’s M4E1 threaded assembled upper receiver and ATLAS S-ONE handguard, this complete upper is aimed at shooters putting together a lightweight 5.56 setup. The slim handguard profile and ATLAS attachment system are intended to keep the front end streamlined while still providing a solid mounting platform for accessories. With the configuration options listed, it suits builders who want a compact, purpose-driven upper for general carbine use without unnecessary bulk. The FDE finish gives it a clean, field-ready look that fits well on a serious working rifle.
Why Hunters Choose the Aero Precision
Includes Aero
Precision's M4E1 threaded assembled upper
Atlas S-one
Size and weight in mind
Proprietary Atlas
Attachment system offers a slim
M-lok Atlas
S-ONE handguard supports accessory mounting
Available 12-inch
12-inch or 15-inch handguard configurations
Key Features
- Complete upper receiver from Aero Precision
- Includes the ATLAS S-ONE handguard
- ATLAS attachment system offers a slim-profile mounting platform
- Designed with size and weight in mind for lightweight builds
- M4E1 threaded assembled upper receiver
- Available with 12-inch or 15-inch M-LOK ATLAS S-ONE handguard
Best Used For
- Lightweight AR builders wanting a slim-profile upper for a compact, streamlined setup.
- Shooters choosing an assembled upper with M4E1 receiver and ATLAS S-ONE handguard.
- Users who prefer a durable mounting platform without adding unnecessary bulk.
- Builders selecting between 12-inch or 15-inch M-LOK handguard configurations.
- Those assembling a 5.56 upper for general range use and modular accessory mounting.
Specifications
| Barrel | 16" 5.56 Mid CMV Barrel, 18" Rifle Barrel |
|---|---|
| Blade Finish | Fde |
| Caliber | 5.56 |
| Gas Block | Low Profile Gas Block |
| Gas Tube | Mid-Length/Rifle Length Gas Tube |
| Handguard | M-LOK ATLAS S-ONE Handguard |
| Handguard Length | 12" or 15" |
| Upper Receiver | M4E1 Threaded Assembled Upper Receiver |
Pros
- Includes Aero Precision's M4E1 threaded assembled upper receiver
- ATLAS S-ONE handguard is designed with size and weight in mind
- Proprietary ATLAS attachment system offers a slim mounting platform
- M-LOK ATLAS S-ONE handguard supports accessory mounting options
- Available with 12-inch or 15-inch handguard configurations
- Offered in complete upper format for straightforward build integration
Considerations & Trade-offs
- The ATLAS S-ONE handguard is described as size- and weight-focused, so it may suit lightweight builds more than setups that prioritize a fuller handguard profile.
- This upper is offered with either a 12" or 15" M-LOK ATLAS S-ONE handguard, so the final configuration depends on the selected variant rather than a single fixed setup.
- The product is presented as a complete upper, which is convenient for assembly planning, but it also means buyers should verify the exact barrel and gas system configuration before ordering.
- The description emphasizes a slim profile and mounting stability, but it does not provide detailed specs for components such as barrel length, weight, or materials beyond the listed barrel and gas system options.
Suggested Comparisons
- AR-15 upper receiver assemblies
- M-LOK handguard-equipped uppers
- Lightweight rifle build components
Suggested Accessories
- M-LOK accessories
- Optic mount
- Backup iron sights
- Upper receiver vise block
Frequently Asked Questions
What is included in this upper receiver assembly?
According to the product data, this is a complete upper that includes Aero Precision's M4E1 threaded assembled upper receiver and ATLAS S-ONE handguard. The listed configuration also references a low profile gas block and a mid-length or rifle-length gas tube, depending on the version.
What handguard options are listed for this product?
The source data lists a choice of 12" or 15" M-LOK ATLAS S-ONE handguard. The title also references a 9" Atlas S-One handguard in FDE, so the exact configuration should be confirmed before purchase.
Is this upper chambered for 5.56?
Yes. The product title and description identify it as a 5.56 assembled upper receiver.
Does the product data specify barrel length?
Yes, but it lists more than one configuration. The short description mentions a 16" 5.56 Mid CMV barrel and an 18" rifle barrel, while the title references an 11.5" carbine configuration. The exact barrel length should be verified from the selected variant.
Is this a complete upper or just the handguard and receiver?
The description calls it a complete upper. Based on the provided data, it includes the assembled upper receiver and ATLAS S-ONE handguard, with barrel and gas system details listed for the configuration.