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
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Rock River Arms
Overview
The Rock River Arms Completed Upper Receiver is designed for the AR-10 platform and features a 16-inch barrel chambered in .308 Win. With its mid-length gas system, this upper provides a smoother cycling experience and reduced recoil, while the 1:10 twist rate ensures stability for a range of bullet weights. Builders often incorporate this upper into precision-oriented builds where reliability and accuracy are essential, making it a solid choice for varied shooting applications.
Specifications
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
Available Merchants(1)
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Build history on GunPartPicker
Today the one retailer we track is out of stock. Listed prices start at $809.99 at Optics Planet for when it comes back.
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