I'd level up new guns more often if they did this more frequently.  Takes too long to get the last proficieny/attachment for sniper rifles.

While you are on the subject of double XP, sorry if this has been discusssed before but i cannot bother to trawl through endless threads, lol i have 5 unused tokens, now with double xp going can i press off a few of these tokens to get even more, i know it worked with one as i tried it but what about 5,almost hit 20th prestige and nothing to use them for so i might as well use them to finish up, will this work ,cheers all.