Iknow an sick gun you can try!
MTAR-X with Redot + Muzzle brake!
IHope you like that! ;) please +REP

Run and Gun:
-Any AR or K7 with Silencer + ExtMag or Grip.
-If you have a headset use Dead Silence and Amplify.
-I recommend deleting Lethals and Tacticals and even your secondary if neccessary to add more perks. Such as quickdraw or stalker or off the grid to give you a bigger advantage.
-If you're a perk person like me use specialist, If you're not but you're good use Assaul with Trinity Rocket, Battle Hind and Helo Pilot (works a peach). If you're neither use support with whatever suits you.
Other:
For other classes such as Snipers use the Lynx with silencer thermal. OP to Hell.
Any Marksman Rifle; OP to hell. (especially with things like burst fire or red dot to allow you to rush more)
Chainsaw (w/Rapid Fire) is OK and fun as SHIT ;)
Shotguns are good on the game but the maps suck for it. Anyway I recommend FP6 with Muzzle Break and Grip. I keep about a 3KD with the weapon using that.
For the last four classes use whatever you like doesn't really matter they are more about fun than doing well. But for shotgun I reccomend Deadeye as if you get on a streak it helps with 1 shots sooo much.
Hope that helped
PEACE!

Rush with MTAR-X with steady-aim!
thats a sick combo, dude

thanks guys, i will try these classes out:) i +Repped you both

SC 2010
Suppressor
Grip

No secondary

Ping
Off the grid
takedown
ready up
sleight of hand
focus

thanks Zyno, thats a good class i tried and +Repped