There’s quite a vulnerable spot right at the back of the throat, where you only have to get through a few layers of tissue to get to the brain stem, if you get a someone with a very small hand (like a baby) to hold the gun, and force it into someone’s mouth, all the way to the back of their throat, angle it upwards a little, by deflecting the soft palate, and press it against the back of their nasopharyngeal cavity, a lucky shot could kill