There currently exist no dedicated 'civilian' weapons in the game, unless you count the tan versions of the MK20.
I don't know if there are any civilian content additions forthcoming, but I think certain scenarios would benefit greatly from having at least one civilian handgun and hunting rifle or shotgun.
If there are no plans to include such weapons, I think at the VERY least a civilian variant of the Zubr revolver could be included. I believe the current version depicted in-game is the 6" barrel, so perhaps the 4" model or even the 2" snub-nose model could be added?
Maybe even in a chrome finish?