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M4e1 Assembled Upper Receiver .300 Blackout Black - M4e1 .300 Bo Assembl Uppr Rcvr M4 10'''' Bbl Pistol-Length Blk
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$519.99
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SKU: 100025513
Overview
Built for a custom AR pistol, SBR, or carbine setup, this assembled upper gives hunters and shooters a .300 Blackout option in Aero Precision’s M4E1 platform. It comes finished in black anodizing and is offered in three length configurations, each paired with a matching handguard length. The upper is sold without a charging handle or bolt carrier group, leaving room to tailor the build to individual preferences. For those assembling a purpose-specific rifle or pistol, it provides a straightforward starting point without unnecessary extras.
Why Hunters Choose the Aero Precision
Chambered .300
Blackout for a custom AR
Black Anodized
Finish gives the upper a
Available Three
Length options to match different
Pistol-length Gas
Low-profile gas block included
Does Not
Include charging handle or bolt
Key Features
- Aero Precision M4E1 assembled upper receiver for AR-15 builds
- Chambered in .300 Blackout
- Black anodized finish
- Available in 8, 10, and 16-inch barrel lengths
- Pistol-length gas system with low profile gas block
- Does not include charging handle or bolt carrier group
Best Used For
- Custom AR pistol builders wanting a .300 Blackout upper with room to choose their own bolt carrier group and charging handle.
- Hunters planning a compact SBR or carbine setup with available 8-inch, 10-inch, or 16-inch configurations.
- Shooters who want an assembled upper receiver with pistol-length gas system and low-profile gas block included.
- Users building around Aero Precision components and preferring a black anodized upper receiver finish.
- Owners seeking a .300 Blackout upper with M-LOK handguard options matched to specific barrel lengths.
Specifications
| Available Lengths | 8", 10", and 16" |
|---|---|
| Barrel Material | Chrome moly |
| Blade Finish | Black anodizing |
| Caliber | .300 Blackout |
| Gas Block | Low profile gas block |
| Gas System | Pistol length |
| Handguard Lengths | 7" for 8" barrel, 9" for 10" barrel, 15" for 16" barrel |
| Muzzle Device | Standard A2 flash hider |
Pros
- Chambered in .300 Blackout for a custom AR pistol, SBR, or carbine build.
- Black anodized finish gives the upper a clean, subdued appearance.
- Available in three length options to match different build configurations.
- Pistol-length gas system with low-profile gas block included.
- Does not include charging handle or bolt carrier group, allowing component selection.
- Aero Precision M4E1 assembled upper receiver platform for AR-15 builds.
Considerations & Trade-offs
- Does not include a charging handle or bolt carrier group, so those components must be selected separately.
- This is a caliber-specific .300 Blackout upper, so it is intended for builds configured around that chambering.
- The product is offered in multiple barrel and handguard lengths, which means fit and handling characteristics vary by the version chosen.
- It is described as an upper receiver assembly for custom AR pistol, SBR, or carbine builds, so it is not a complete firearm-ready package on its own.
Suggested Comparisons
- AR-15 upper receivers
- .300 Blackout barrels
- AR pistol/SBR components
- M-LOK handguards
Suggested Accessories
- Charging handle
- Bolt carrier group
- M-LOK accessories
- Optic mount
Frequently Asked Questions
What comes included with this upper receiver assembly?
The upper is sold without the charging handle or bolt carrier group, so those parts must be selected separately.
What caliber is this upper chambered for?
It is chambered in .300 Blackout.
What finish does the upper have?
The long description states that it is finished with black anodizing.
What barrel and handguard length options are listed for this product line?
The description lists 8", 10", and 16" barrel options, with matching handguards of 7" M-LOK EM-7 for the 8" barrel, 9" for the 10" barrel, and 15" for the 16" barrel.
What gas system is used on this upper?
The product description specifies a pistol-length gas system with a low profile gas block.