First you better figure out what your friend means by silenced Mp5 and it's not that hard to do a little research. Since it's your friend who wants a specific look, why not ask him to just google a few images of the Mp5 himself rather than a bunch of us filling out a form for you over and over again which might not be anything he wants in the first place.
The common silenced one is the Mp5 SD6 but he could be wanting an Mp5 navy with silencer, etc. There are dozens of variations on the Mp5. Tell your friend to google and find a picture of what he wants in the first place.