Here is another quick install video of the HPA Gas Mag Adapter designed by QCB Russian and from Infidel Airsoft Team... "Here is a awesome invention one of our fellow airsofters CQB Russian in cali made for all of you that love doing the HPA Tapping to your GBB mags. This literally takes away the ruining of your mags that you pay good money for and no need to drill into them anymore."