More pavlov balance autism coming down the line, probably a ways off because more feedback is needed before stuff gets ironed out- what guns do you think are still failing to pass the baton as far as output is concerned? 
As it stands, the pretty much for-sure changes are;
uzi: -100 payout to 400$, inline with other SMGs
mp5: helmet bleed +5%, still very low compared to other SMGs, even high RPM stuff like the p90 (which has 55% bleed, vs the MP5's previously 30%, now 35%, proposed 40%)
vert grip money on kill reduced to -100 to be identical to horizontal grip, it's -150$ right now when they do pretty much the same thing
p90: its still fucking ass, -100$ cost at minimum, possibly -200$

Stuff I've peeked at/flagged for being a bit weaker feeling for their price, but am not quite sure what can or should be tweaked on them;
saiga: base damage 20 ala nuspas could work, but making it even cheaper could work too. This one is rough, as it currently feels very strong but ONLY within extremely close range. More damage would make it more flexible, but also make it EXTREMELY strong in close range- imagine a saiga around at least one corner every round tier, likely putting it past rifles w/ usability for close areas, albeit with shit range capability. Making it cheaper would make it more regularly fieldable, but keep the "gotta have 4200$ at least, regardless of set price" issue in mind, and the fact that why buy it even at 2500$ if an AK is much more well-rounded. Needs more poking
ump: base damage w/o increasing ttk, eco improvements (pays ~200 when fully kitted, could (should) be more)- new headshot mod makes it identical to Bizon stats and ttk but with less ammo, more drop, and only 200$ cheaper that's quickly gone with attachments, really needs to bring more pizzazz
beretta: 200$? it's likely to be a future starter gun, and round1 performance is already extremely good, unlikely to need changes, but still piss awful past round 1 where the glock can at least do something