So, I'm going for the 50 wins in Gun Game and played a little Sharpshooter as well and, to my surprise, I unlocked suppressor for SVU-AS. I was under the impression that you can't level up weapons in that mode as I've never had it happen previously. So, I tried to see if I could level up other guns and unlocked the ones you get in Gun Game. Nope, nothing, though I could swear I've never made any level progress with KAP(?) and that burst firing handgun previously as I never use handguns outside party games, yet now they both are where you get them after 1 kill. No other weapon showed any progress. However, during Sharpshooter, I unlocked the suppressor for another sniper rifle. So, what's going on? Can you or can you not level up weapons in Party Games? Is it just a slower process, the way earning xp is in Combat Training?