there is a catch: the catch is that you can be banned. DON'T LEAVE TILL YOU READ THE REST OF THIS!
You can get banned but, only if you don't een out your k/d. Dont get over a 5.0 k/d over that isn't believable. on your guns dont go over a 30 k/d that'll be unbelievable either. I know people who have a 622 k/d that will be stupid to have. this will work all/most of the time if it doesn't work redo all steps.
so if you want to do it but do it right read this.

1.have a friend in public match
2. have a custom game already made if you dont have one you can make on or add me (put gt in comments and i'll go into pvt chat with you.)
3. go into custom games load the game file than back out
4. hover over custom game and do join exploit glitch on your friend that's in public match (press y when hovering over custom games, press x and spam a)
5. If you get in a lobby by yourself go to player match and load the game from there (if not in your own lobby redo step 4 till you have it.) and plug in second controller
6. have friend plug in second controller, than press b and back out with party
7. find an actual match of combat training, objective and join
8. back out before it finds a game
9. go to custom games again and load the hacked/saved file that you used
10. join friends game and enjoy
Last but not least make sure you even out all k/d's do not get super k/d's you will be banned.
P.S. people aren't saying this but it will show up in you feed idk y but it will. Have fun and use this exploit safely.
If you have problems message put gt in description and help after and i'll pvt message you.