I never use stock. And they patched it for smg in that 1.06 patch so it wasn't so fast, which I guess you guys already know. I tend to use grip on smgs and then something like silencer, extended mags or red dot. I find it doesn't really make much of a difference what attachments I use with smgs.
Only vector, AN-94 and assault shield left to get gold for primary weapons. AN-94 goes pretty good but not really feeling the vector. Not accurate enough for my liking. Assault shield sucks, mainly because of the lag. when someone straifs you and you are looking directly at them, from their perspective you are at an angle (due to lag) and so it's really easy for them to shoot you in the side. Even on good connection games it's really obvious.