I have some experience with the MP5 to include the silenced version--however most of it was with RNJ ammo for training purposes; not sure what the SD had in it as I just borrowed it for the moment. My impression (and it is only that) is that the gun will eat anything happily including H/S. I have run H/S plus P plus through Glocks and untuned High Powers with no problems I have never seen any malfunctions with the MP5, period. I have heard that they do not like Blazer aluminum cased ammo but that is the only thing I have ever heard on possible ammo reliability in the MP5. I presume that H&K would put something out if it were an issue as everyone in the world uses them--probably including NZ SAS. They are one of my favorite guns. Unfortunately I couldn't take one with me when I retired and no one gave me one for a parting gift--darn.
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