If ur struggling may i suggest
all the maps that look like towns, eg crossfire and district or ambush. use either an M16 or AK, but dont run about like a madman, take your time, peek round corners, the M16 is better for distance kills, same with AK if you get to close, u'll get killed by a better waepon. U could also try a light machine gun (think the SAW is the first one unlocked, its good at distance.
If your playing Vacant(warehouse) or Wet Work (boat) i would recommend the MP5 casue the game is fought at close quarters.
If its downpour you can use any of the above.
My two fav setups at the mo are
M60 with grip
Shotgun with grip
Perk 1 - NA cause i have grip
Perk2 - Overkill (lets me carry to weapons)
Perk 3 - Extreme conditioning
Second one is
Uzi
Shotgun with grip
Perks same above
But at mo am trying to do M14 challenges
But the shotguns are class, took me awhile to work out how to use them, but feck me, up close one shot kills, awesome. done both shotgun challenges so thats over 100 kills, and i kept them cause of close damage.
think of doing sniper rifle but am crap with them
