It is actually available in several calibers. I believe the most common is 9mm parabellum, but it is also available in 7.62x51, 5.56x45mm, and 7.62x39.
HK
2-20000 thousand USD.
2000-25000 depending on when it was made and who can own it.
Yes. It unscrews just like the fake suppressor on the MP5 22lr rifle.
Yes. Every officer has a pistol (most 9x19mm) and there is also a machine pistol (most MP5 by HK) in every police car.
Yes, it does but you will have a hard time trying to find one.
The MP5 submachine gun typically uses the 9x19mm Parabellum cartridge. This caliber is known for its reliability and effectiveness in close-quarters combat. The MP5 is designed to accommodate various types of 9mm ammunition, including full metal jacket (FMJ) and hollow point rounds.
See attached link. Besides caliber difference, a few product improvements.
Colt, Kimber, Smith and Wesson, Kimball, Para Ordnance, STI, HK,
games for mp5
More than likely a problem with the magazine.
Heckler & Koch discover mp5.