Rock River Arms XBT31752B.V1 | X-1 .308 20″ Barrel | 20+1

The Rock River Arms LAR-BT3 X-1 Precision Operator (XBT31752B.V1) is a semi-automatic modern sporting rifle chambered for 308 WIN/7.62X51 NATO. It features a 20″ fluted stainless barrel, a free-float 17″ aluminum M-LOK handguard, and ships with a Magpul Gen 3 precision stock and a Rock River magazine. The rifle is configured for accuracy and sustained use with a 20-round detachable magazine and an oversize winter trigger guard for gloved operation. For an optic under $1,000 that complements the platform’s precision intent, consider a Vortex Viper PST Gen II 3-15×44.

Suggested applications include precision target shooting and medium-to-long-range hunting. This chassis-level configuration emphasizes repeatable accuracy and accessory flexibility for shooters who prioritize reliable, tunable performance.

Product Specifications

• The caliber is 308 WIN (7.62X51 NATO).
• The action is SEMI-AUTOMATIC.
• The barrel length is 20 inches and the barrel is fluted stainless with a bead-blast finish.
• The handguard is a FREE FLOAT 17″ ALUMINUM M-LOK unit.
• The magazine capacity is 20 rounds and it uses standard PMAG-compatible magazines.
• The rifle includes a Magpul Gen 3 precision stock in black.
• The overall length is 41 inches.
• The rate of twist is 1:10″.
• The weight is 9.7 pounds.
• The stock material is SYNTHETIC and the stock color is BLACK.
• The rifle includes an RRA Hunter muzzle brake.
• The rifle ships with a Rock River case one magazine included.
• The UPC for this item is 842834108442.

This configuration pairs a match-oriented barrel and free-float handguard with a familiar, ergonomic stock and a 20-round detachable magazine, making it a capable option for shooters who need a robust, accuracy-focused AR-platform in .308/7.62×51. The combination of a fluted stainless barrel and M-LOK handguard supports accessory mounting and thermal stability during extended strings of fire.

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