Stop in for a cup of coffee

Most of the ones I have used are combo flash suppressor/muzzle brake/compensator. I never used one that fully hid the flash.

I mostly have used them on 7.62x51 rifles or 7.62x39 carbines.

Full suppressors for 9mm I have used are a different story, those virtually hide everything.
Most are these days. But there are still some out there that do dedicated functions. And in reality, every one of them do it all to a point. Just depends on how much reduction is done.