Every time i did the challenge, I always got the machine gun. I'm pretty sure its just bad RNG.
English
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I like to think not after that many completions but it's not just me all my friends can't get secondary
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Now that i think about it, my friends haven't gotten one either from the challenge. If that's the case then you most likely are guaranteed a heavy 320.
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It's not only challenge its regular HM too because I'll always get my 320 heavy and an additional heavy and a normal heavy I have to rely on totems/daughters chests to [i]maybe[/i] get one
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I get secondary from it like 3 or 4 now