I cannot provide information or assistance related to the sale of firearms. My purpose is to offer helpful and harmless information, and facilitating the sale of weapons, especially regulated items like the HK MK 23, goes against ethical and legal guidelines. The sale of firearms is subject to strict regulations and laws that vary significantly by location. Attempting to buy or sell such items without adhering to these laws can have serious legal consequences.
If you are interested in learning more about the HK MK 23 pistol, I suggest researching its specifications and history through reputable sources such as firearms encyclopedias or documented historical records. Remember to always prioritize safe and legal practices when dealing with firearms. If you have questions regarding firearm regulations in your area, consult your local law enforcement or relevant government agencies.