Battlefield 4 Campaign Weapons

Good evening, yesterday I finished the campaign in the hardest difficulty and managed to unlock quite a few guns usable in the Campaign itself, some were part of the x/3 progress, others were the ones I got from guards.

In multiplayer, some of those can only be obtained when the campaign is passed.

I have waited a full day and I can only keep using the Groza 4 because I bought the premium version.

Any help?

Also, it says I have the DLC's installed but I see nothing?

Aren't the DLC more Campaign stages?

Thanks.