If you can control recoil really good like ones on ak 47 i suggest you get an-94, really good tap fire and damage ratio. Just lots of recoil. Close to 3-5 bullet kill or something, i always snipe with it on oil rig .
An-94 isn't available for perm, but nonetheless, it's a good gun along with ak74m
Ok, m416 cqb and the g36 valk are your best options. I own both perm and believe the cqb is still better even at long distance unless you play on PAPA server all the time which I don't. So, cqb is best 'cause of the low recoil, spread, and that AWESOME reflex site.