Martin is back with a new episode of Hong Kong Off The Grid TV (HKOTG) and he has with him some upgrade parts from Poseidon. One is the Poseidon Air Cushion Precision Inner Barrel for the Glock 17; Turbo Valve for the gas magazine; Ice Pick GBB Flute for the Loading Nozzle, and the Formula G to wipe your barrel with. Watch the video as he puts them together for a custom GBB pistol.