According to a loading screen hint the extra weight of the supressor also reduces recoil.
I've been reading the description on the silencer, a few times, and I still don't get exactly what advantage it gives you? So in theory you don't show up on the mini-map, although isn't there a bug that most guns with silencers still show up? Lower damage at range, ok, but decreased hip accuracy? So what's the benefit? Can you actually see muzzle flash? I've never spotted another player due to it. Tracer fire yeah, that helps me find people all the time. Not muzzle flash. I rarely see the scope "glint" either.