Rossi, the Brazilian airsoft company, present their R17 and R18 Gas Blowback Pistols in this video... "Check out the full review of two more releases from the AIRSOFT ROSSI line. Hybrid airsoft models, original operation with green gas, but which can be converted to CO2 quickly and easily. GBB Rossi R17 Airsoft Gun GBB Rossi R18 Airsoft Gun Equipment that can reach a speed of 280 fps 85 m/s* (BB's 0.20 g) in Green Gas mode. Full metal pistols with blowback, system that reproduces the action of the bolt of a real pistol during the firings."