I don't know what all this needing to level up stuff is all about. You get the best gun in the game as soon as you start. The M16a.
Though I have unlocked every gun, the favourite combination is the M16a with red dot sight, usp silenced, frag x3 (though you don't get this perk for quite a while), UAV Jammer and any other perk (I find most of these perk 3 things to be a bit useless)
Shotguns are great fun on small levels though. Pretty much one hit kills =)
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