works as of 1-20-11 just tested and i have my pro perks and gold camo guns back!
warning:
use at your own risk. especially if your classes have been reset before.

if this glitch still worked then my special way would be useful, but its patched. whatever heres my way:
Host:Invite Friend to Player Match.
Host:Starts player match and then backs out, WITH OUT PARTY, and goes to the menu where it says xbox live, local,shop etc.
Friend:backs out and will get the circle. He does the glitch, (press b, goes to system link, makes class with gold on primary, waits for popup and presses a, goes to private match, enjoys his wonderful gold.)