Did anyone find one? if yes where?

I checked the GECK and there doesn't appear to be one in the game, though maybe i haven't looked at the right place. There's a 10mm silencer in there though. It'd be really lame if I couldn't get a silencer for my Maria?

I think the weapon mods are randomly added to merchants (and possibly loot, I swear I looted a kit once). I also don't think you can mod unique weapons, I couldn't do the extended mag or the other addon to Maria, though silencer could be different.

By all appearances, unique weapons cannot be modded. Which, of course, svcks after finding Lucky, managing to pick up two .357 mods off one vendor, then finding they won't show up in the mod menu. :sadvaultboy:

The only Mods you can get for the 9mm is a scope and extended mags. Unique weapons, like the Maria, can not be modded.