Orsogato,
Unfortunately, H&K doesn't make the MP5 in .45. Only in 9mm, 10mm, and .40 S&W. However, H&K has developed the UMP which is chambered in .45!
Corbon91
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"The rifle is the first weapon you learn how to use because it lets you keep your distance from the client. The closer you get to being a pro, the closer you can get to the client. The knife, for example, is the last thing you'll learn."