This mod will outline snipers, very simple. I took some screenshots to show that.

HOW TO USE:

Put it under (whatever)\PAYDAY 2\assets\mod_overrides. SuperBLT required.

Note: Type of snipers can be marked by this MOD are followings:

SWAT Snipers
FBI Snipers
Murkywater Snipers
Russian Mecenary Snipers

Other types can not be marked by this mod. I may fix that sometime, may not.