I think it has something to do with your stats... I think that if you get the gun in the locker the first time then copy your stats (Located here: AppData\Local\Plutonium\storage\demonware\18397\user and its the two files that start with zm) when you play in the future you can replace your stats with the old one to reset them back to what they were. This also works for perma perks if you care about them also.
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