Mach Sakai takes the Tokyo Marui Hi-Capa 5.1 Gold Match Custom for a review. This is already ready for action air competition if you plan on not going for more upgrades and join the open division. Based on the best-selling Hi-Capa GBB Series it has high quality reinforced polymer slide and lower frame with textured grips and backstrap checking. The hold parts are the outer barrel, trigger, hammer, recoil spring plug, safety, and grip screws. For target acquisition it has a fibre optic front sight.