Rock River Arms Completed Upper Receiver A4 9MM Luger 7 Inch Barrel 1-10 Twist 1/2-36 Thread Free-Float Handguard A2 Flash Hider Black
$466.99 at MidwayUSA · 2 stores
In stock
Best price
$467.49at MidwayUSA
Out of stock Sale checked Oct 23, 2026
In stock now instead
- Rock River Arms Completed Upper Receiver A4 9MM Luger 7 Inch Ba… $466.99at MidwayUSA
- Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm … $450.49at MidwayUSA
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $467.49Salechecked Oct 23, 2026 | Out of stock | Buy at MidwayUSA | |
| OpticsPlanet | $509.99Salechecked 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.
Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm 16 Inch Barrel Mid-Length Profile 1-9 Twist 1/2-28 Thread A2 Flash Hider Black
$450.49 at MidwayUSA · 2 stores
In stock Sale
Price history
Lowest in-stock price in the last 30 days: $467.49 at MidwayUSA. Dashed line = out of stock. Tracking since Oct 12, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| MidwayUSA | $467.49 | $467.49 | $467.49 |
| OpticsPlanet | $509.99 | $499.99 | $509.99 |
Since Oct 12, 2026.
About this part
The Rock River Arms Mountain Pistol 10.5in Upper Black is a 10.5" AR-15 upper receiver from Rock River Arms. It's sold by 2 stores, from $467.49 to $509.99. The lowest in-stock price in the last 30 days was $467.49 at MidwayUSA.
Fits and works with
- Barrel length
- 10.5" · Handguards
Specifications
- Manufacturer
- Rock River Arms
- Color
- Black
- Platform
- AR-15
From the manufacturer
Rock River Arms Mountain Pistol 10.5in Upper Black. 5in Upper. Formulated by using some of the very most strong and dependable components in existence these AR15 Upper Receivers from Rock River Arms offers you something that gives you many years of consistency. Rock River Arms has been making top quality merchandise for a number of years and the Rock River Arms Mountain Pistol 10.5in Upper is their particular approach to revealing how much they are concerned. Right here at OpticsPlanet we make it our responsibility to receive the perfect solution for all of your preferences and showcasing the Rock River Arms Mountain Pistol 10.5in Upper is one thing that we're happy to offer. Specifications for Rock River Arms Mountain Pistol 10.5in Upper: Manufacturer: Rock River Arms Caliber: 5.56x45mm NATO Overall Length: 20 in Barrel Length: 10.5 in Barrel Profile: Standard Gas System Length: Pistol Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 1/2x28 Muzzle Device: A2 Flash Hider Color: Black Gun Model: Universal Fabric/Material: Stainless Steel Handguard Length: 9.5 in Gun Rail: Full Top Rail Weight: 4 lb Magazine Included: No Package Contents: Rock River Arms Mountain Pistol 10.5in Upper Bolt Carrier Group Charging Handle Assembly What firearm models does the manufacturer say Rock River Arms Mountain Pistol 10.5in Upper is compatible with? The manufacturer says that Rock River Arms Mountain Pistol 10.5in Upper is compatible with UniversalRock River Arms MT0364: Mountain Pistol 10.5in Upper Black
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