Well, 10mm is basically just 'a normal 9mm pistol, but 1mm bigger', so that by itself wouldn't be anything other than just a pistol.<br/><br/>It could be penetrating, in which case it would probably be a 10mm gauss pistol or something, or impact, which would be a 10mm with some kind of super-hollowpoints or something like that.<br/><br/>If it's just a 10mm pistol, I would make it stylish, concealable, silenced, or maybe burst.