The Troy TRX-308 BattleRail is built off the revolutionary TRX Extreme and brings the same sleek, lightweight, low-profile design to the more powerful .308 platform. Proprietary barrel nut provides superior strength. Includes handguard, barrel nut and three quick-attach rails. Not compatible with RRA LAR -8. Machined from 6061-T6 hardened aircraft aluminum and finished in MIL-SPEC Type III hard coat.