And For those who cant do it this is the Simple rotation : 1st: Open Call of duty MW3 Multyplayer
2nd: Go to barraks in mode select and alt+tab
3rd: Open Cheat Engine and load The download file + Open Process of COD MW3
4rd: Duble click in value of each weapon and Type 179601 In all weapons Value
5 : Play one online match and with first kill with weapon you just earn 31 lvl on it
Notice: there are not all weapons in the download file. Much weapons but not all. Just try weapons in game to notice which one is in list