While this was a MARSOC marine who told me that, it might give you a start:
Quote:
The MP5 is used at times. It is mainly used during VBSS, anti-piracy, and GOPLAT operations, as well as PSD operations. We are currently phasing them out and replacing them with the MP7.
The MP5 is a fine weapon that is very reliable. The MP5K is used the most out of all of the variants. It makes a decent room broom.
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So basically, he's talking about the MP5, then saying it's getting replaced by the MP7... so what was true for the MP5 mostly is for the MP7; it's used as a primary.
Note that the Mk17 is a battle rifle, so no need for a full auto secondary at all. Actually, I've never seen a full auto secondary on anyone other than actual snipers (with bolt actions or large semi-autos such as the Barret). Don't expect anything more than a pistol as a secondary to an Mk17 or EBR.