As I mentioned in this thread the F2000 is from a store pack (or by itself there), the AK74, M60, and KSVK are from battlecrates, and the AA12 and Honey Badger are to be challenge rewards.
Perhaps you were under the impression that when Ubi said they'd make guns directly purchasable in the store going forward you thought they meant they'd stop locking things behind battlecrates? That would be better, but of course Ubi aren't going to do that, it would undermine their gambling business.
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