Is it possible to get your detection risk below 3?
I currently have most of the Ghost perks. When carrying the CAR-4, the Bernetti 9, and wearing a two-piece suit, my detection risk is 3.
No matter what mods I put on my weapons, though, I can't seem to get my detection to go any lower.
Is 3 visibility the cap, or could I get it lower with more stealthy equipment?
No. 3 detection risk seems to be a hard limit. Even with maximized concealment (fully modded Mosconi 12G, modded Compact-5, and Two-Piece suit) and the Ghost perks, your detection risk still comes out to 3.