The DS Arms ESC - Enhanced Sand Cut complete bolt carrier group is the pinnacle of M16 bolt carrier group production. They took their standard Mil-Spec bolt carrier group and ungraded with real world no-nonsense features that make sense, not just make it flashy! First and foremost, they looked to their roots in the FAL Battle Rifle and incorporated L1A1 style sand cuts on the entire load bearing surfaces of the carrier. These sand cuts allow any sand, dirt or debris that may have gotten into the action to easily be cycled out. After the sand cuts they knew we would have to give this bolt carrier group a finish that puts function over form, the DS Arms NTFE - Nickel Teflon finish. They cho Mfg: D.S. Arms