Question is what happen when he pull a wireless silent running smartgun on you. In AR, will you see that it IS wireless but not yet identified...? Will there be an AR question mark tied or attached to the smartgun that you can try to identify? If you check for all hidden icons in the area do you get a bunch of question marks in your AR, each and everyone of them tied or attached to physical electronic devices...? Where one of the question marks is tied or attached to the street samurai.
Or do you just get a long unordered list of all wireless silent running devices in the area, but with no indication on what type of device they belong to or any indication on if the signal is close or far away...?
....or something in-between the two maybe?
If he pulls a silent running smart gun on you, you won't see any icon info at all. It's running silent. If you suspect he's got it's wifi turned on, you should be able to spot it directly. I assume that attempting to spot an icon that isn't there always fails, so if the gun really is a throwback or has it's wifi off, you're wasting your time in a fire fight. Good luck with that.
If you check for hidden icons in the area, I assume you get a count, but no data on them beyond that. It won't show you their locations or put icons up in your AR where it thinks they are. Just the number of devices within 100 meters or inside the Host with you.
Once an icon is spotted, assuming you don't get more information with the hits on the Matrix Perception test, you get it's appearance and possibly it's location in AR if it's connected to a device within 100 meters, and isn't currently a persona (which move around compared to device icons). IE: what you get for public icons within 100 meters without even needing to make a check. If the icon's owner is currently running Wrapper, the appearance may be wrong, but verifying what an icon represents is a basic function of matrix perception.