The L89 Series of M4’s are built on SOLGW forged uppers and lowers, and utilize the L89 Drivelock Handguard. Built with an extended steel barrel nut, and their button rifled 4150CMV barrels, these M4’s are built for demanding end users. These L89’s also feature a A5 Length Buffer System, Liberty Charging Handle, Liberty Fighting Trigger, B5 P23 Grip, B5 Bravo Stocks, B5 Winter Trigger Guards, and an Ambi Selector. The 7-sided L89 handguard features integral steel QD cups on both sides. These include one (30) round magazine.