Isn't the maturity of some people today incredible ?
Illspirit, you dip s**t, he is asking people who play Combat Arms and know what they're talking about.
For CQB , use an S1. For a sniper rifle, use an S3, eliminates tracer. Don't take any notice of the suppresor ratings, it's a load of crap.
S3 COMPLETELY takes away tracer, and S2 COMPLETELY takes away Muzzle flash.
Anyway, suppresors stuff up the spread of sniper rifles, so I wouldn't bother to be honest.
Hope I helped.