12.6" TRX 308 Extreme DPMS LP BLK. * TRX .308 Extreme BattleRail, Black. * The TroyTM TRXTM-308 BattleRail is built off the revolutionary TRXTM 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.