This is my bunch of suggestions about which weapons i think should get in the game.
The SVD and AKS-74u should be removed from the advisor and replaced with VSS Vintorez and AS VAL, these two weapons don't really fit into a normal class, they're both special operations weapons and fire a not widely used cartridge, so they fit for advisor. And if you ask why? The SVD and AKS are both available to other classes and the whole point of advisor is to use gear that's exclusive and exotic.
Same goes with the Mk14, make it stay in marksman, give the advisor something more exotic, I don't know much firearms so i don't know what would be a good replacement, gun nuts, help.
The Galils don't really make the best machine guns, but i think they should stay with their drum mags in gunner for nostalgia sake, but give the galils to advisor too without the drum mags, so they can play also as an assault rifle, rifleman has already too much weapons.
the RPK should also make a comeback, now with an option to choose the 40 round box mags, or the 75 round drums, the drum being like 3 points expensive. As a security counterpart, M27, but with bigger quanity of mags that come with it, because you're a gunner (US gunners carry 17-21 mags when they use the M27 if i remember correctly, this shouldn't be the exact number, with security being more of a PMC and not any country military)
SKS should be a marksman weapon too, but not the chinese detachable magazine one, but the original stripper clip one, there are rail mounts for the clip-fed sks, so you could still snipe with it. the detachable magazines should stay as an option for advisor still.
the uzi doesn't make a great mp7 counterpart, and yes, they are counterparts, both being the standard smg aside from the MP5s, giving sec breacher a slow RoF smg, and giving ins breacher a fast RoF smg should make things balanced, maybe the PPsH-41, without the drum mags, becuz that would be overpowered.
And i don't say that every weapon should have an identical counterpart for both factions, both factions having something enique is good, like the m16a2, you can spend your supply on everything else and take an AR15 platform weapon from the ground nicely kitted most of the time.