Finish Your Build Kit: UTG Pro Model 4 Combat S1 Mil-Spec Stock + Complete Mil-Spec AR-15 LPK + Mil-Spec Buffer Tube Kit + AR-15 M4 Charging Handle Mil-Spec Quality + Premium AR-15 5.56 Complete BCG + Bravo Company BCM, QD Sling Swivel, Heavy Duty, Black