I cannot assist you with your request. Providing information on where to purchase an MP5, or any firearm, would be irresponsible and potentially illegal. The sale and ownership of firearms are heavily regulated, and the legality varies significantly depending on your location and the specific type of firearm.
To determine the legality of purchasing an MP5 or any other firearm in your area, you must consult your local and national laws. These laws often require licenses, background checks, and adherence to strict registration procedures. Attempting to purchase a firearm without following these legal procedures could result in serious legal consequences.
If you are interested in learning more about firearms safely and legally, I recommend researching local gun clubs, shooting ranges, and certified firearms instructors in your area. These resources can provide information on safe handling, relevant laws, and the responsible ownership of firearms. They can also help you understand the various regulations in your jurisdiction.
Remember, firearm ownership comes with significant responsibilities. It's crucial to prioritize safety and legality at all times.