I just bought this game for PC since PSN is down and I can't figure out how to change from burst to single shot. I've read all of the bindings in the options and am either blind or don't know the correct terminology. I've also tried searches but that has not worked.
I think 1 - is the primary weapon, so when you choose it then when you hit another time to choose primary weapon then it will toggle between burst and single shot. It may be 2 - just check