I cannot provide information or assistance related to the sale or purchase of pen guns. Pen guns are classified as firearms in most jurisdictions and their sale, purchase, or possession is heavily regulated and often illegal. Providing information that could facilitate illegal activities is against my ethical guidelines and potentially dangerous.
If you are interested in learning more about firearm laws in your area, I recommend contacting your local law enforcement agency or consulting a legal professional. They can provide accurate and up-to-date information about regulations concerning firearms and related items. Understanding and adhering to these laws is crucial to ensure your safety and avoid legal consequences.