Rock River Arms Completed Upper Receiver Standart A4 .308/7.62X51mm NATO 20 Inch Barrel 1-10 Twist 5/8-24 Thread A2 Handguard A2 Flash Hider Black
$664.99 at MidwayUSA · 2 stores
In stock
Rock River Arms Completed Upper Receiver Operator ETR .308/7.62x51mm 16 Inch Barrel 1-10 Twist Mid-Length Profile 5/8-24 Threat Free-Float Handguard
Rock River Arms · Upper Receiver
No ratings yetBest price
$809.99at OpticsPlanet
Out of stock Sale checked Oct 21, 2026
In stock now instead
- Rock River Arms Completed Upper Receiver Standart A4 .308/7.62X… $664.99at MidwayUSA
- Rock River Arms Completed Upper Receiver Predator HP A4 .308/7.… $967.99at MidwayUSA
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $809.99Salechecked Oct 21, 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 Upper Receiver Predator HP A4 .308/7.62X51mm NATO 20 Inch Barrel 1-10 Twist Free-Float Handguard Brake Black
$967.99 at MidwayUSA · 2 stores
In stock
Price history
Dashed line = out of stock. Tracking since Oct 16, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $809.99 | $809.99 | $809.99 |
Since Oct 16, 2026.
About this part
The Rock River Arms Completed Upper Receiver Operator ETR .308/7.62x51mm 16 Inch Barrel 1-10 Twist Mid-Length Profile 5/8-24 Threat Free-Float Handguard is an AR-10 complete upper receiver from Rock River Arms. One store lists it, OpticsPlanet at $809.99.
Fits and works with
- Caliber
- .308 / 7.62x51 · Shop matching ammo
- Bolt
- AR-10 (.308 / 6.5 CM) · Bolt carrier groups
- Gas system
- Mid-length · Handguards
- Muzzle thread
- 5/8x24 · Muzzle devices
- Barrel length
- 16" · Handguards
Specifications
- Manufacturer
- Rock River Arms
- Type
- Complete
- Platform
- AR-10
- Caliber
- .308 / 7.62
From the manufacturer
Rock River Arms Completed Upper Receiver Operator ETR .308/7.62x51mm 16 Inch Barrel 1-10 Twist Mid-Length Profile 5/8-24 Threat Free-Float Handguard. 308/7.62X51mm Completed Upper. Developed using some of the most extremely robust and dependable substances in existence these AR15 Upper Receivers by Rock River Arms will provide you with a product that will give years of consistency. Rock River Arms has been developing high-quality products for a number of years and the Rock River Arms Operator ETR .308/7.62X51mm Completed Upper is their manner of revealing exactly how much they are concerned. At OpticsPlanet we make it our obligation to obtain the best solution for all your specifications and presenting the Rock River Arms Operator ETR .308/7.62X51mm Completed Upper is one thing that we are happy to offer. Specifications for Rock River Arms Operator ETR .308/7.62X51mm Completed Upper: Manufacturer: Rock River Arms Caliber: .308 Winchester 7.62x51mm NATO Overall Length: 24 in Barrel Length: 16 in Barrel Profile: Standard Gas System Length: Mid Length Barrel Twist Rate: 1-10 Firearms Threads Per Inch: 5/8x24 Handguard Type: Free-Float Muzzle Device: A2 Flash Hider Finish: Anodized Color: Black Fabric/Material: Billet A4 Gas Block Journal Size-Diameter: .750 in Handguard Length: 13 in Handguard Style: Quad Rail Gun Rail: Full Top Rail Barrel Material: Chrome Moly Weight: 5.85 lb Bolt Carrier Group Included: COM-SPEC Charging Handle Included: COM-SPEC Magazine Included: No Included Accessories: None Mount Type: M-LOK Package Contents: Rock River Arms Operator ETR .308/7.62X51mm Completed Upper Bolt Carrier Group Charging Handle Assembly Extended Charge Handle Latch 5-Slot Picatinny Rail Quick Disconnect Port Rock River Arms OP0500BT: Completed Upper Receiver Operator ETR .308/7.62x51mm 16 Inch Barrel 1-10 Twist Mid-Length Profile 5/8-24 Threat Free-Float Handguard A2 Flash Hider Black
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