It's rough but possible took me several tries and I about rage quit when I got six kills 3 games in a row then on the fourth got my seventh kill just as the game ended. Didn't count. I then went to classic playlist and tried to take advantage of some noobs but there was at least one tryhard in every lobby stat boosting by slaughtering the rookies. That and with everyone using auto rifles that tickle you just enough to knock off your aim and cause a non crit kill was infuriating. When I finaly finished it I waited my week then picked up my first curse from the gun Smith and put it straight in the vault.