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Rock River Arms Completed Upper Receiver X-1 .308/7.62x51mm 18 Inch Barrel 1-10 Twist 5/8-24 Threat Free-Float Handguard Brake Black

Rock River Arms · Upper Receiver

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Rock River Arms Completed Upper Receiver X-1 .308/7.62x51mm 18 Inch Barrel 1-10 Twist 5/8-24 Threat Free-Float Handguard Brake Black

Best price

$974.99at MidwayUSA

In stock checked Nov 13, 2026

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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
18" · Handguards

Specifications

Manufacturer
Rock River Arms
Color
Black
Type
Complete
Platform
AR-10
Caliber
.308 / 7.62
Gas system
Mid
Barrel length
18"
Twist rate
1:10
Thread pattern
5/8 x 24
Length
17"
Weight
114.72 oz

Where to buy

StorePriceAvailabilityBuyAdd to build
MidwayUSA Best price $974.99checked Nov 13, 2026 In stock Buy at MidwayUSA
OpticsPlanet $889.99Salechecked Nov 13, 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.

Price history

Lowest in-stock price in the last 30 days: $961.99 at MidwayUSA. Dashed line = out of stock. Tracking since Oct 16, 2026.

Show the prices as a table
StoreLatestLowestHighest
MidwayUSA$974.99$961.99$974.99
OpticsPlanet$889.99$889.99$889.99

Since Oct 16, 2026.

About this part

The Rock River Arms Completed Upper Receiver X-1 .308/7.62x51mm 18 Inch Barrel 1-10 Twist 5/8-24 Threat Free-Float Handguard Brake Black is an AR-10 complete upper receiver from Rock River Arms. It's sold by 2 stores (1 in stock), from $889.99 to $974.99. The lowest in-stock price in the last 30 days was $961.99 at MidwayUSA.

From the manufacturer

Rock River Arms Completed Upper Receiver X-1 .308/7.62x51mm 18 Inch Barrel 1-10 Twist 5/8-24 Threat Free-Float Handguard Brake Black. 308/7.62X51mm Completed Upper was developed in order to be the best item for any person looking for a top quality selection.. Formulated working with several of the most sturdy and long lasting materials available these AR15 Upper Receivers through Rock River Arms will provide you with something that will give you years of dependability. Rock River Arms has been developing high-quality products for a very long time and the Rock River Arms X-1 .308/7.62X51mm Completed Upper is their very own approach to demonstrating how much they care. At OpticsPlanet we make it our responsibility to get the most suitable product for your requirements and presenting the Rock River Arms X-1 .308/7.62X51mm Completed Upper is one thing that we are happy to offer. Specifications for Rock River Arms X-1 .308/7.62X51mm Completed Upper: Manufacturer: Rock River Arms Caliber: 7.62x51mm NATO .308 Winchester Overall Length: 26 in Barrel Length: 18 in Barrel Profile: Heavy Gas System Length: Mid Length Barrel Twist Rate: 1-10 Firearms Threads Per Inch: 5/8x24 Handguard Type: Free-Float Muzzle Device: Brake Finish: Anadized Gas Block Journal Size-Diameter: .875 in Handguard Length: 17 in Gun Rail: Full Top Rail Weight: 7.17 lb Barrel Material: 416R Stainless Steel Bolt Carrier Group Included: COM-SPEC Magazine Included: No Condition: New Mount Type: M-LOK Package Contents: Rock River Arms X-1 .308/7.62X51mm Completed Upper Bolt Carrier Group Charging Handle Assembly Rock River Arms X308A0700B.V1: Completed Upper Receiver X-1 .308/7.62x51mm 18 Inch Barrel 1-10 Twist 5/8-24 Threat Free-Float Handguard Brake Black

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