>>292384467
Revolver/Deagle depending on preference for eco and pistol round.
Naked AKM when you have $2500
AUG is safer with armor than naked.
50cal when you are rich.
Knife and maybe a flashbang for full eco rounds.
HE grenades on the maps with tight chokepoints.
That's the meta on the official servers. SMGs are too weak against armor, Famas has decent damage but AUG is so close in price and much better. Shotguns are expensive, short range and unreliable compared to revolver once you learn to control it properly. Two sawn-off can still work but are highly situational and expensive.
Meta on /vrg/ community servers is very similar but has a little more variety; Again anything that can kill in one shot is meta but buffed SMGs and nerfed AUG means you have more choices for accurate full auto bodyshots. Pistol round is more diverse.