1. Have a Friend invite you to a player match.
2. Have him find a ground war lobby that is in intermission/pre-game. **The amount of intermission time is the amount of time you have to do this glitch**.
3. Once in you will need to 'leave without party' and quickly go to local and hover over *system link*.
4. Once hovering over system link, press Y to bring the friends menu and find your friend's name.
5. Press X to join his game. It should say "Joining session In progess" and you will still be hovered over system link.
6. On your friends screen, it will look like you joined but not on your screen.
7. Once you have "joined" press "system link" and then "create a class".
8. Your multiplayer classes should come up, and pick the one you wanted the pro perk on.
9. On the class, press whatever perk tier the perk is on click "toggle pro perks".
10. Then click X or A until the pro perk purchase menu comes up [Note: you might need to press toggle pro perks again until it works].
11. When it does, click "buy and equip".
12. Go back to player match and make sure you have the perk pro.

--You can do this glitch for 2 or 3 perks at a time, they just must be on that one class.
--Do not change the glitched perk, as you will lose the "pro" status of the perk.
--You can still change every other aspect of the class, and even the perks that you din't get with this glitch.
--You are using 3000 cod points to buy the perk, so this glitch is not getting free, just getting without any effort. Be aware of this before attempting this glitch.