There's no real "best" weapon but in MLG they use Famas and Ak74u. But i would recommend the commando.
This is more of an opinion question, but the assault rifles seem vastly superior in Call of Duty: Black Ops. I recommend the AK-47 with extended mags.
Lvl 44
Yes. Balistic Knives and Crossbows
fails the level :P
because there is a mystery box that you have to open
yes
you can get it at campaign or unlock it on multiplayer
Scavenger Or Scavenger Pro
ak74u with rapid-fire
you get it from the random weapon box by luck.
yea you can get ak 47 the great weapon
Claymore.