Description
The Rock River Arms LAR-BT3 X-1 in .308 Win pairs billet receivers with a 20-inch cryogenically treated fluted stainless barrel and a Magpul PRS Gen 3 precision stock. Rock River guarantees it to 1 MOA at 100 yards, which is a serious claim for a gas gun. 
A Precision Rifle That Happens to Be Semi-Automatic
The X-1 is configured as a designated marksman rifle rather than a fighting carbine. Everything about it, from the stock to the trigger to the barrel treatment, is chosen for putting rounds precisely on target rather than for weight or speed. The Rock River Arms LAR-BT3 X-1 gives up nothing to a bolt gun on the first shot and beats it comfortably on the second.
20-Inch Cryogenically Treated Barrel
The barrel is fluted stainless steel with a 1:10 twist, cryogenically treated to relieve the machining stresses that cause a barrel to walk as it heats. That process is the difference between a rifle that holds zero through a string and one that opens up after five rounds. Fluting removes weight and increases cooling surface. At 20 inches the barrel gives .308 the velocity it needs without becoming unwieldy.
Magpul PRS Gen 3 Stock
The PRS Gen 3 adjusts for both length of pull and cheek height using tool-less wheels, so you can set it precisely for your body, your optic height and whatever position you are shooting from. It is the stock most precision shooters fit aftermarket, and it is here from the factory. It also adds rearward weight, which helps the rifle track flat.
Billet Receivers and Rifle-Length Gas
Upper and lower are RRA LAR-BT3 billet units, machined rather than forged for tighter tolerances and a closer fit. Underneath, a low profile gas block feeds a rifle-length gas system. The long gas system means low port pressure, gentle unlocking and a soft recoil impulse, all of which help the Rock River Arms LAR-BT3 X-1 stay on target between shots.
Two-Stage Ultra Match Varmint Trigger
RRA fits its two-stage Ultra Match Varmint trigger, a lighter variant of the Ultra Match aimed specifically at precision shooting. Take-up is smooth and the break is clean with no perceptible creep. For a 1 MOA guarantee, this is the trigger that makes the guarantee achievable by an ordinary shooter.
17-Inch M-LOK Rail and Hunter Brake
The lightweight free float rail runs 17 inches with M-LOK slots throughout, leaving room to mount a bipod well forward without any contact with the barrel. The muzzle wears RRA’s Hunter Muzzle Brake on 5/8×24 threads. The rifle weighs 9.7 pounds and measures 41 inches with the stock retracted. One magazine and a carrying case are included.
Specifications
- Manufacturer: Rock River Arms
- Model: LAR-BT3 X-1
- Type: Semi-automatic rifle, AR-10 pattern
- Caliber: .308 Winchester, 7.62x51mm NATO chamber
- Barrel: 20 in., fluted stainless steel, cryogenically treated
- Twist: 1:10 in.
- Muzzle Device: RRA Hunter Muzzle Brake, 5/8×24 threads
- Gas System: Rifle length with low profile gas block
- Upper Receiver: RRA LAR-BT3 billet A4
- Lower Receiver: RRA LAR-BT3 billet
- Handguard: RRA 17 in. lightweight free float, M-LOK compatible
- Stock: Magpul PRS Gen 3 precision
- Grip: Hogue rubber
- Trigger: RRA two-stage Ultra Match Varmint
- Weight: 9.7 lbs.
- Overall Length: 41 in. retracted
- Accuracy: 1 MOA at 100 yards
- Included: One magazine, carrying case
- Manufacturer Part Number: XBT31752B.V1
- UPC: 842834108442
Who Should Buy It
This is for the shooter who wants precision rifle accuracy without giving up rapid follow-up shots. Gas gun matches, designated marksman work, long-range practice and hunting where a second shot matters all suit it well.
The Rock River Arms LAR-BT3 X-1 weighs 9.7 pounds before an optic, bipod and loaded magazine, so it is a rifle you shoot from a position rather than carry a long way. It is also expensive, and a muzzle brake makes it loud for everyone standing nearby.
Hunters covering ground should compare a lightweight bolt action, and shooters wanting a general-purpose carbine should look at a 5.56 rifle in our catalog. Every firearm we list ships to your chosen FFL and is transferred in accordance with federal and state law.
Browse our full firearms catalog for more rifles, pistols and shotguns, and check factory specifications for the Rock River Arms LAR-BT3 X-1 at Rock River Arms before you order. Our team can help with optics, bipods, ammunition or transfer paperwork.
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