This game's current arsenal is pretty well-done balance wise. There are only a couple of particularly weak guns that could use a tuning up, and very few (if any) overpowered ones. However, due to the smaller nature of this game's arsenal, these poorly-balanced outliers are still quite detrimental to have lying around.

I will attempt to give my thoughts on these particular weapons, and try to balance them in accordance to the other already well-balanced guns in the game.

The AWP is most in need of a buff. Giving it a far faster bullet travel speed, reduced tracer visibility*, and less bullet drop would make it the perfect tool for new Recons to learn the ropes of their class, as well as a headshot machine for the more skilled players.

The Barrett needs a buff as well to set it apart from the C-Tac. Right now they practically do the same thing, but the C-Tac can oneshot torsos while the Barrett can't. If the Barrett was given the ability to slightly damage vehicles by maybe 3-5% per shot, that would give it enough of a niche to set it apart.

The Dragunov is mostly fine, but could use some tuning up. Giving it reduced tracer visibility* like mentioned with the AWP above would allow it to more efficiently act as a mid-range weapon, now without alerting the entire enemy team to your location with giant white tracer beams.

The Kriss Vector is a blend of the MP5 and Mac-10 that somehow inherited none of their good aspects. Giving it an incredibly reduced recoil impulse (much like the IRL version of the weapon) would allow it to stand out more from its "parent" guns.

The P90 is mostly alright in its current state, but a faster bullet travel speed would send it over the edge into being a top contender among its fellow SMGs.

The Bizon is practically just a worse P90 with a slightly higher mag cap, so why not lean into that and make its magazine even more spacious? It would also probably benefit from more damage per shot, maybe not as much as the P90's but definitely 1-2 points more than it has now.

The Glock is made useless the second you unlock the Beretta. Its higher RPM doesn't even matter when some players can't even pull the trigger that fast, and it still loses the TTK fight to the Beretta anyways. Leaning into the faster fire rate, it could be given a high-kill unlock attachment that turns it full auto with a significant RPM boost to give it a niche among the other secondaries.

The SCAR is largely unproblematic, but it is still most likely the best gun in the game as of now. Turning its 34 damage back to 30 (meaning it will 4-tap at any distance now instead of the previous 3-tap close range and 4-tap long range) would set it more into the niche of being incredibly good at long range and worse in close quarters.

*Example of what the less visible tracers could look like:
https://m.youtube.com/watch?v=q4YEvFgKrsg&pp=ygUSYnVsbGV0IHZhcG9yIHRyYWls0gcJCZkLAYcqIYzv

Another comedically large arsenal-related suggestion I've made:
https://app.betahub.io/projects/pr-7682550116/feature_requests/3546