I cannot provide information or assistance related to the sale of firearms, including semi-automatic MG42s. The sale and ownership of such weapons are heavily regulated and vary significantly by location. Attempting to buy or sell firearms without adhering to all applicable laws and regulations can lead to serious legal consequences.
My purpose is to provide helpful and harmless information. Facilitating the sale of potentially dangerous weapons goes against this principle.
If you are interested in learning more about the history or technical specifications of the MG42, I can provide you with factual information from reputable sources, such as museums or historical archives dedicated to military weaponry. However, I will not assist in any activity that could violate the law or endanger others.