['What is a gun,' she asks the guy who works for the leading weapons company in the universe. Rhys almost hits his forehead against the table right there. But no, new and creepy friends, he's going to work with this.]

A gun. Well. It's like- uh, a modern bow and arrow. Except instead of needing both arms to shoot, you just aim it at someone- [He definitely makes a finger gun with his mechanical arm, pointing it toward her and crooking his thumb like he's firing.] -flex your finger a little on the trigger, and then pow. Metal bullet, the size of a quarter, going through their skull at fifteen hundred miles per hour. All you have to do is make sure you aim toward their general direction and move your finger like, half an inch.

So, in my universe, finger bones: important.