I recommend AR's only.
snipers sure they might be handy but any scoped AR is what you want.
Tap out your shots,
Guns to try M4A1, K2, G36E, Aug A1 and FAMAS all scoped.(or if you have the rank M416)
Also don't forget to bring along your M16, its an ok back up gun
and you can "borrow" one of your fallen teammates weaps.