Resolute Mk4 300BLK Assembl Upper 14.5"bbl W/P&W Brake BLK
$519.99 at OpticsPlanet · 3 stores
In stock Sale
M4E1 .300 BO Assembl Uppr Rcvr M4 16" Bbl Pistol-Length BLK
Aero Precision · Upper Receiver
No ratings yetBest price
$499.99at 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
- Resolute Mk4 300BLK Assembled Upper Rcvr 16.1" Bbl Black $452.49at Ammunition Depot
- WMD Guns AR-15 .300 Blackout 16in Free-Float M-LOK Complete Upp… $562.50at Ammunition Depot
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $499.99checked Oct 23, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $594.99Salechecked 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.
Similar upper receivers in stock
This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
Resolute Mk4 300BLK Assembled Upper Rcvr 16.1" Bbl Black
$452.49 at Ammunition Depot · 5 stores
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WMD Guns AR-15 .300 Blackout 16in Free-Float M-LOK Complete Upper Assembly Compensator NiB-X Nickel Silver
$562.50 at Ammunition Depot · 2 stores
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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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ABC RIFLE COMPANY AR-15 .300 AAC Blackout Pistol 10in Quadrail Handguard Complete Upper Receiver w/BCG And Charging Handle Red
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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 | $499.99 | $499.99 | $499.99 |
| OpticsPlanet | $594.99 | $594.99 | $594.99 |
Since Sep 28, 2026.
About this part
The M4E1 .300 BO Assembl Uppr Rcvr M4 16" Bbl Pistol-Length BLK is an AR-15 complete upper receiver from Aero Precision. It's sold by 2 stores, from $499.99 to $594.99.
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
- 16" · Handguards
Specifications
- Manufacturer
- Aero Precision
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
From Aero Precision, the AR-15 M4E1 .300 Blackout Assembled Upper Receivers. Chambered in 300 Blackout, the upper is finished with black anodizing and available in three lengths, each with different length handguards. This upper does not come with the charging handle or bolt carrier group, allowing the user to personalize their upper receiver even more! The Aero Precision Assembled Upper Receiver also features: M-LOK EM-7 7" for 8" barrel, 9" handguard for 10" barrel, 15" handguard for 16" barrel 8", 10", and 16" carbine length chrome moly barrel Pistol length gas system w/ low profile gas block Standard A2 fl Mfg: Aero Precision
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