Soldier front 2iem lieutenant weapon choice?

ok im almost 2ieme lieutenant and i still dont know which weapon to choose first i wanted famas but we told me that it suck at range...but still idk which weapon should i choose between famas,galil,g3a3 can anyone tell me the cons and pro of each weapon plz and help me decide and right now i have a psg 1 and ak as primary weapon.