Stephen, This rifle is built for precision with a 20" stainless steel bead blasted cryogenically treated HBAR heavy barrel that has a 1:10 twist. It uses RRA LAR-8 Mags and can also use FAL metric L1A1 mags.
--Specifications and Features--
Rock River Arms LAR-8 Predator HP 308A1530
Semi Automatic Rifle
308 Winchester accepts 7.62x51mm NATO
Forged RRA LAR-8 Aluminum Lower Receiver
Forged A4 Aluminum Upper Receiver
Forward Assist
20" Stainless Steel HBAR Heavy Barrel
Bead Blasted Cryogenically Treated Barrel
1:10 Twist
RRA Aluminum Free Float Handgaurd Tube
Gas Block with Front Sight Rail
A2 Buttstock Black
RRA Two Stage Trigger with Winter Trigger Guard
Hogue Rubber Pistol Grip
20 Round Magazine
Uses FAL Metric L1A1 Magazines
Weight 8.6 Pounds
Overall Length 40"

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it has a 20 inch (non fluted) SS heavy barrel -Specifications and Features-- Rock River Arms LAR-8 Predator HP 308A1530 Semi Automatic Rifle 308 Winchester accepts 7.62x51mm NATO Forged RRA LAR-8 Aluminum Lower Receiver Forged A4 Aluminum Upper Receiver Forward Assist 20" Stainless Steel HBAR Heavy Barrel Bead Blasted Cryogenically Treated Barrel 1:10 Twist RRA Aluminum Free Float Handgaurd Tube Gas Block with Front Sight Rail A2 Buttstock Black RRA Two Stage Trigger with Winter Trigger Guard Hogue Rubber Pistol Grip 20 Round Magazine Uses FAL Metric L1A1 Magazines Weight 8.6 Pounds Overall Length 40"

Buds rifle has a (Non Fluted) 20" Stainless Steel HBAR Heavy Barrel - Bead Blasted Cryogenically Treated Barrel - 1:10 Twist .