Sons of Liberty Gun Works M4 L89BS, Semi-automatic, AR, 5.56NATO, 13.7 Pinned (16 OAL) Barrel, Midlength Gas System, Liberty Fighting Trigger, B5 Grip, NOX Flash Hider, Black, 30 Rounds, 1 Magazine LRF-L89BS-13.7 The L89BS Series of M4's use SOLGW BROADSWORD-89 precision upper on a forged 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.