I was playing and trying to find a good gun combination i found that my favorite gun was Primary: Gerund AR: silencer, speed sling, yeotek red dot sight, and the high-capacity Magazine Secondary:Bulpdaun SMG: with the same attatchments and medium body size i found it to kick ass with a gun buff
Well yes the soldier (ammo) and engineer (damage) are best for the guns. I like smg's for the amount of ammo they carry the ar's are packing light. So typically i carry a bulpdaun and a carb-9 the kross is good to. You may find the Sea Eagle pistol amazing as well if you like pistols. I have been also running the Mossington shotgun.
I run anything from two smg's, to an smg an a pistol, or a shotgun and a pistol.
oh uh smg attachments: speed sling, muzzle break, duct-taped mag, red dot
pistol attachments: speed holster, muzzle break, rapid fire
shotgun attachments: speed sling
Its all preference and map related.