PS4 Resident Evil 5 Mercenaries United Solo Public Assembly Chris Heavy Metal 150 kills

after getting 150 kills with wesker stars, i have to figure which is mt next character that is doable for me. i have done no mercy 400 kills with chris heavy metal in PA before but failed in regular merc. decided to give it another try. whoa, with a little luck, 150 kills in PA. mine is next, but not sure it is is doable with chris heavy metal.