TDM/ SD
Red Dot MP5 if your a rusher
Silenced AK-47 if your a camper
Always use Stun Grenade, helps kill them easier
3xFrag, honestly, you really need this if you rush, especially maps like Crash, Wetwork etc.
Claymores if your a camper, which I admit I was until I noticed a guy on SD just rush and was amazing so I did the same never went back

Stopping power/ Double tap (Just the hidden stopping power they add the same damage just eats up the bullets a bit)
Steady aim, well I need this anyway, especially because sometimes I don't aim.
Hardcore
Grenade Launcher attached AK47/ M4
Stun grenade
Overkill- With M21/ Dragunov, though I prefer the M21, better accuracy and more steady.
Steady aim again