Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, Black M4
$567.00 at OpticsPlanet · 3 stores
In stock Sale
R-One M4E1 5.56mm Assembled Upper M4 10.5"bbl Carbine Threaded FDE
Aero Precision · Upper Receiver
No ratings yetBest price
$569.99at Brownells
Out of stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $569.99checked Oct 1, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $569.99Salechecked Oct 1, 2026 | Out of stock | Buy at OpticsPlanet | |
| MidwayUSA | $569.99checked Oct 1, 2026 | Out of stock | Buy at MidwayUSA |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $569.99 | $569.99 | $569.99 |
| MidwayUSA | $569.99 | $569.99 | $569.99 |
| OpticsPlanet | $569.99 | $569.99 | $569.99 |
Since Sep 28, 2026.
About this part
The R-One M4E1 5.56mm Assembled Upper M4 10.5"bbl Carbine Threaded FDE is an AR-15 complete upper receiver from Aero Precision. It's sold by 3 stores, all at $569.99.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Carbine · Handguards
- Barrel length
- 10.5" · Handguards
Specifications
- Manufacturer
- Aero Precision
- Color
- Flat Dark Earth
- Type
- Complete
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
This assembled upper includes Aero Precision's new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. 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. INCLUDES: M4E1 Threaded Assembled Upper Receiver - Anodized Black or Cerakote FDE depending on model. 15" ATLAS R-ONE M-LOK Handguard with 16"CMV Barrel OR 15" ATLAS R-ONE M-LOK Handgua Mfg: Aero Precision
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