Nextgen Retros shows us the custom Tokyo Marui Colt M16A4 MWS GBBR which is not only used by the U.S. Marines but also by Taliban via captured/abandoned U.S. weapons when they were in Afghanistan. Using the Marui MWS GBB tech, this custom buildn also uses an Inokatsu or Vipertech M16A4 Steel Outerbarrel + Steel Frontsight, Inokatsu M5 RAS with KAC markings, Real Steel Grip Pod, G&P M16A2 Stock Set, and EG Tactical ACOG Clone with Markings."