Can I use DLC weapons in multiplayer?
Since I preordered on Origin, I have both the A-12 Raider shotgun and the M-55 Argus Assault rifle.
I kinda like them.
Does unlocking them as DLC make them available in multiplayer as well?
The Argus Assault rifle is not available for use online. I also have it unlocked but it is only present in the single player campaign.
I can't answer authoritatively for the Raider shotgun, but I expect that it works the same way as the Argus, unfortunately.