ShinWei Chiou does some upgrades on different airsoft guns from Krytac and Tokyo Marui using upgrade parts from different companies. He chooses the Prometheus inner barrels, the A-Plus Hop-Up, TNT T-Nub, TNT T-System, Unicorn Airsoft Hop-Up 60 Bucking, Unicorn Airsoft Nub, and more. Also included are shooting tests... "Old players have their own opinions and preferences for tube skins, while newbies can only try their luck from many modified parts! Hence the idea of ​​installation and testing of the 'Precision Tube Kit".