Elbee Tactical outlines the process and results of a green gas upgrade mod for the Tokyo Marui MWS gas blowback rifle magazine. They first establish a baseline by testing a stock magazine, which runs out of gas just over halfway through the second magazine. From there, they perform the mod by shortening a metal tube inside the magazine to allow for a larger gas fill. After reassembling the magazine, he tests the upgraded version and finds that it can fire two extra full magazines before running out of gas, a significant performance boost.