Rock River Arms Completed Upper Receiver Coyote Carbine .300 AAC Blackout 16 Inch Barrel 1-8 Twist 5/8-24 Thread Free-Float Handguard Vortex Flash
$667.24 at MidwayUSA · 5 stores
In stock Sale
Assembled M4-89 300 AAC Blackout 13.9" Bbl 13" M89 Rail & Flash Hider
Sons Of Liberty Gun Works · Upper Receiver
No ratings yetBest price
$712.50at Brownells
Out of stock Sale checked Oct 23, 2026
In stock now instead
- Rock River Arms Completed Upper Receiver Coyote Carbine .300 AA… $667.24at MidwayUSA
- APF Armory .300 AAC Blackout Pistol 2.0 Complete Upper Receiver… $852.00at MidwayUSA
- 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 | $712.50Salechecked Oct 23, 2026 | Out of stock | Buy at Brownells |
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.
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Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $712.50 | $712.50 | $712.50 |
Since Sep 28, 2026.
About this part
The Assembled M4-89 300 AAC Blackout 13.9" Bbl 13" M89 Rail & Flash Hider is an AR-15 complete upper receiver from Sons Of Liberty Gun Works. One store lists it, Brownells at $712.50.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 13.9" · Handguards
- Handguard length
- 13" · Barrels
Specifications
- Manufacturer
- Sons Of Liberty Gun Works
- Type
- Complete
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
The SOLGW M4-89 Upper Half comes with SOLGW's Combat Barrel and M89 Rail, and is available in 13.9" 300blk with NOX muzzle device. No BCG or C/H *13.9" barrels come pinned and welded flash hiders for OAL of 16"* Mfg: Sons Of Liberty Gun Works
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