MPK Goldsmith - bullet bug

Hello,

today I bought the MP5 ultimate Goldsmith.
In my Storage and when the Wespenstich is in my back stands, on the bottom +10 bullets and at the top +21 bullets. Picture attached..
But when I Start a Game, the mp5 habe only 40 shots. So only +10.
can you explain me, why I don’t geht the +21 bullets too?

And by the way, why it is a rifle?


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