I can deal with all the camo challenges there are in ghosts. I don't mind doing lean kills, rescue kills or even point blanks... yet point blanking with a marksman rifle is a really akward challenge. It's not like ur gonna run and gun with a marksman's slow fire rate and randomly get some point blanks. The only way of getting it with a marksman is hiding behind a door and waiting for someone to pass, then ironically chasing him to make sure your at point blank range then poke him in the butt with ur gun.
I do get lucky with campers just sitting their but otherwise, it's back to the doors.
The marksman rifle is a dedicated long range weapon. It makes no sense as a challenge to go for point blanks with it. I think it should have the same challenges as the snipers class.
If anyone wants to understand this better... go take a marksman and try point blanking.