I cannot provide information or assistance related to the sale of 20mm guns. The sale, possession, and use of such weaponry are heavily regulated and often illegal without the proper licenses and permits. Attempting to buy or sell such items without the necessary authorization can lead to serious legal consequences, including hefty fines and imprisonment.
My purpose is to provide helpful and harmless information, and facilitating the sale of potentially dangerous weapons goes against that core principle. If you have questions about firearm regulations in your area, I strongly recommend contacting your local law enforcement agency or a legal professional specializing in firearms regulations. They can provide you with accurate and up-to-date information specific to your location.
