The L89BS Series of M4’s use SOLGW BROADSWORD-89 precision upper on a billet lower, and utilize the L89 Drivelock Handguard. Built with an extended Titanium barrel nut, and a 4150CMV barrel, these M4’s are built for demanding end users. These L89BS’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 a Quick Ambi Selector. The 7-sided L89 handguard features integral steel QD cups on both sides. These include one (30) round magazine.