guys let me tell you some thing this hack is not instant level up mastery hack its a slowly but surely mastery hack it increases ur mastery each kill by like 5% it helps u in leveling up ur mastery and if u wonder why rifle takes so long to level up its because the exp is split into two parts shotgun and rifle since the shotgun doesnt have its own group. the hack works but u need to play until the match is over and get alot of kills in order to get about 10% mastery level everytime thankyou - COD3RIN Rocks
Put that in system32 or if your pc is 64bit put to systemwow64 and run the game again
Thanks COD3RIN. Manage to get it to work. but just like they said. while being in the game the mastery does go up fast. but once u finish the game and exit the room it went back to before. But still thanks for the work!