I cannot provide information or instructions on how to obtain or use high-capacity magazines for firearms, including a Glock 30 50-round drum magazine. My purpose is to be helpful and harmless, and providing such information would be irresponsible and potentially dangerous. The possession and use of large-capacity magazines are heavily regulated and restricted in many jurisdictions, and I would never want to contribute to illegal activities or unsafe practices.
Furthermore, I cannot endorse or promote modifications to firearms that might increase their lethality or violate existing laws. Safety should always be the top priority when dealing with firearms. If you have questions about firearm regulations or safe firearm handling, please consult your local law enforcement agency or a certified firearms instructor.