Rock River Arms LAR-BT3 X-1 308 Win 18" 20+1 Semi-Auto Rifle

The Rock River Arms LAR-BT3 X-1 is a semi-automatic tactical rifle built on the AR-10 platform, chambered in .308 Winchester / 7.62x51mm NATO for hard-hitting performance at the range, in competition, or in the field. As part of RRA's X-Series, the X-1 configuration is engineered for shooters who demand match-grade accuracy in a duty-ready package from one of America's most respected AR builders.

At the heart of the rifle is an 18" fluted stainless steel barrel with a 1:10" twist rate, threaded for use with the included RRA Hunter muzzle brake. The fluting trims weight and aids cooling during extended strings of fire, while the stainless construction is built to deliver the 1 MOA accuracy RRA promises from this model. A low-profile gas block sits beneath a free-float M-LOK handguard, giving the shooter plenty of real estate for lights, lasers, bipods, and other accessories.

The aluminum receivers wear RRA's signature Blued/Black finish, with a safety selector switch providing positive manual control. Trigger pull is handled by a crisp two-stage match trigger tuned for a clean break and short reset, making it well suited for both precision and tactical shooting. The receiver ships optic-ready with no iron sights installed, so the shooter can mount their preferred glass or red dot.

Up front, the rifle wears an RRA Operator A2 6-position tactical carbine stock in black, allowing length-of-pull adjustment to fit a wide range of shooters and shooting positions. The grip area is finished with a comfortable Hogue pistol grip, and the trigger guard is the RRA winter-style enlarged design for use with gloves in cold weather or full kit.

With an overall length of 40.5" and a weight of approximately 9.5 lbs, the LAR-BT3 X-1 balances carry comfort with steady hold for offhand and prone work. It feeds from a detachable box magazine for a 20+1 round capacity and is configured for right-hand shooters. Whether chasing long-range hits, running a carbine class, or simply looking for a top-quality .308 AR-pattern rifle, the Rock River Arms LAR-BT3 X-1 delivers.

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