Resolute Mk4 300BLK Assembl Upper 14.5"bbl W/P&W Brake BLK
$519.99 at OpticsPlanet · 3 stores
In stock Sale
M4E1 300BLK Assm Upper Gov 8"bbl Pistol-Length Threaded BLK
Aero Precision · Upper Receiver
No ratings yetBest price
$518.99at Brownells
Out of stock checked Oct 23, 2026
In stock now instead
- Resolute Mk4 300BLK Assembl Upper 14.5"bbl W/P&W Brake BLK $519.99at OpticsPlanet
- WMD Guns AR-15 .300 Blackout 16in Free-Float M-LOK Complete Upp… $562.50at Ammunition Depot
- Resolute Mk4 300BLK Assembled Upper Rcvr 16.1" Bbl Black $452.49at Ammunition Depot
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $518.99checked Oct 23, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $534.99Salechecked Oct 23, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
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This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
WMD Guns AR-15 .300 Blackout 16in Free-Float M-LOK Complete Upper Assembly Compensator NiB-X Nickel Silver
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Resolute Mk4 300BLK Assembled Upper Rcvr 16.1" Bbl Black
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Andro Corp Industries AR-15 Complete M-LOK Upper Receiver with Flash Hider Assembly .300BLK 16.5in 8in Barrel Medium Pistol Length 1-7 Twist 5/8x24
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Andro Corp Industries AR-15 Complete M-LOK Upper Receiver with Flash Hider Assembly .300BLK 24.75in 16in Barrel Medium Pistol Length 1-7 Twist 5/8x24
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In stock Sale
Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $518.99 | $518.99 | $518.99 |
| OpticsPlanet | $534.99 | $534.99 | $534.99 |
Since Sep 28, 2026.
About this part
The M4E1 300BLK Assm Upper Gov 8"bbl Pistol-Length Threaded BLK is an AR-15 complete upper receiver from Aero Precision. It's sold by 2 stores, from $518.99 to $534.99.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Pistol · Handguards
- Barrel length
- 8" · Handguards
Specifications
- Manufacturer
- Aero Precision
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
This complete upper includes Aero Precision's new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Their proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. M4E1 Threaded Assembled Upper Receiver 7"" M-LOK ATLAS S-ONE Handguard with 7" .300 Blackout CMV Barrel OR 9"" M-LOK ATLAS S-ONE Handguard with 10"" .300 Blackout CMV Barrel OR 12"" M-LOK AT Mfg: Aero Precision
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