Just sharing my upgrades for my hi-capa 5.1. GSB slide look so good and was in perfect finish. Excellent quality. But quite costly. Slightly tight when insert to the frame. But it just getting smoother after a few rack. Other parts were just drop in. I have a few Guarder slides before but the quality is huge different then the GSB. So i was happy what i paid for. This is the first time for trying all UAC upgrades. At first, I was doubt in aluminum nozzle. But they just work amazingly well and smooth. They are just drop in without mod. The bang sound was just loud. FPS is stable. Some of my fri