Some humans are born specifically with the ability to change their shape and abilities into inanimate objects. You're one of them, turning into any gun and shoot bullets from your mouth is a piece of cake. Even though the idea of having a deal into a contract as an object with an owner makes you shiver.
"Ck," Alroyn clicked his tongue when he missed. Pulling the lever and empty bullets were thrown out before he ready to take aim again. And he missed. In an annoyed voice he said, "Cant you just spit forward more better aim?"
The reason he chose you, a change-form-able rifle, was because he thought it would be interesting to be a sniper with a living weapon. But seeing you seem to deliberately deflect all the bullets makes him annoyed. Still, you're his unique rifle.