PS4 Resident Evil 5 Mercenaries United solo Ship Deck Chris Heavy Metal 150 kills

i didn't think i could do 150 kills with chris heavy metal. but after i did it in the missile area, i thought why not just give it shot? did it in my 3rd try. ran out of time 1st try, got killed by the chain majini the 2nd try. the only two stages that i might be able to do probably is the mine and the prison. no way i can do village, ancient ruins and experimental facility.