Bayonets were added to Fedorov and Johnson 1941 in the Far Eastern Front update, but the guns we already owned are still not equipped. If someone wants to equip them, they need to spend thousands of credits for a second set of new guns just to get the bayonets. Which is not fair.
I suppose we should be given a way to get the bayonets separately. A few years ago, it was solved with an event where large numbers of bayonets were given out to fill the gaps in the old weapons. In the future, I think we can expect bayonets on another couple of guns, like the MKb 42 or the MP34(ö). Maybe it’s time to make them buyable on the spot, for every weapon that has an empty slot for them?