Teru shows how to fit the B&T USW G-17 Carbine Conversion Kit made by Archwick with a G17 GBB pistol... "I made the UMAREX/VFC Glock 17 Gen.5 gas handgun that appeared in the previous video into a pistol carbine. The B&T USW Carbine Kit is a cheaper resin model. The dot sight is from a USP with a standardized exterior and is compatible with real guns, so it should be able to withstand the impact of CO2."