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M4e1 Assembled Upper Receiver 5.56 Mid-Length - M4e1 5.56 Nato Assem Uppr Rcvr M4 16'''' Bbl Mid-Length Black
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$565.99
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SKU: 100025509
Overview
Aero Precision’s assembled upper receiver is built for shooters who want a ready-to-finish foundation for a 5.56 setup without starting from scratch. It arrives fully assembled and leaves out only the bolt/carrier group and charging handle, giving experienced users room to choose those components to suit their build. The mid-length gas system is intended to provide a smoother cycling setup than a standard carbine-length tube, and the M4E1 forged receiver is designed for compatibility with mil-spec parts. With its extended accessory-ready handguard, this upper fits well on a practical rifle intended for range use, training, or field-ready customization.
Why Hunters Choose the Aero Precision
Fully Assembled
Upper receiver reduces setup time
Mid-length Gas
System is designed to slow
Compatible Mil-spec
Mil-spec parts, including bolt carrier
M4e1 Forged
Standard parts compatibility
Available 16-inch
A 16-inch civilian barrel option
Key Features
- Aero Precision M4E1 5.56mm Mid-Length upper receiver, fully assembled except for bolt/carrier group and charging handle.
- Mid-length gas tube configuration is described as longer than standard carbine tubes.
- Available with a 16-inch civilian barrel or a 14.5-inch military barrel.
- Forged M4E1 receiver design combines machined-receiver styling with mil-spec parts compatibility.
- Enhanced carbine upper includes an extended, accessory-ready handguard.
Best Used For
- Hunters building a 5.56 upper and wanting a fully assembled receiver minus BCG and charging handle
- Users who prefer a mid-length gas setup for a smoother cycling feel in a carbine upper
- Custom rifle builders seeking a forged M4E1 receiver with mil-spec parts compatibility
- Shooters wanting an extended accessory-ready handguard for adding lights, optics, or other gear
Specifications
| Barrel Length | 16" |
|---|---|
| Barrel Options | 14.5" or 16" |
| Caliber | 5.56mm |
| Cartridge | 5.56 NATO |
| Color | Black |
| Compatibility | Mil-spec parts compatibility |
| Configuration | Fully assembled |
| Gas System | Mid-Length |
| Handguard | Extended accessory-ready handguard |
| Included Components | Does not include bolt/carrier group or charging handle |
| Receiver | Forged M4E1 receiver |
| Receiver Type | Upper Receiver |
Pros
- Fully assembled upper receiver reduces setup time for custom builds.
- Mid-length gas system is designed to slow gas velocity for cycling reliability.
- Compatible with mil-spec parts, including bolt carrier groups.
- M4E1 forged receiver offers a machined look with standard parts compatibility.
- Available with a 16-inch civilian barrel option.
Considerations & Trade-offs
- Fully assembled upper still requires a bolt/carrier group and charging handle before it is complete.
- Mid-length gas system is paired with a 16" barrel option, so it is not the same setup as a standard carbine-length upper.
- The description notes this is a carbine upper, which may matter for buyers expecting a different configuration.
- Accessory-ready handguard adds flexibility, but it also reflects a more specialized setup than a basic upper receiver assembly.
Suggested Comparisons
- Complete upper receiver assemblies
- AR-15 handguards and rail systems
- Bolt carrier groups
- Charging handles
Suggested Accessories
- Bolt carrier group
- Charging handle
- Rifle cleaning kit
- Optic mount
Frequently Asked Questions
What comes included with the M4E1 5.56 Mid-Length Upper Receiver?
It comes fully assembled, but it does not include a bolt/carrier group or charging handle.
Is this upper compatible with standard mil-spec parts?
The description says the forged M4E1 receiver combines the look of a machined receiver with mil-spec parts compatibility, including the bolt carrier group.
What does "mid-length" mean on this upper?
According to the description, mid-length refers to the gas tube. It is longer than a standard carbine tube.
What barrel option is referenced for this upper?
The long description says this upper is available with either a military 14.5" or civilian 16" barrel, depending on the version.
Is this upper described as a complete rifle?
No. It is an assembled upper receiver, not a complete rifle, and it still requires a bolt/carrier group and charging handle.