(This is a made up grimoire card about this gun) "The dragon King looked at me. He said, 'Why have you come? I see no weapon in your hands.' I responded to him, 'That's the point,' and with that he rose to the ceiling and attacked. I pulled out my hand cannon. He opened his mouth, and I pulled the trigger. I came in with nothing. I came out with a head full of light and a heart darker than the Hive. I was balanced.": Grimoire card 135, Ghost Fragment "Dragon's Maw".
Ok, so this gun was inspired by several of Destiny's more, "strange" weapon selection (mostly exotics, but a few legendaries). It fires one bullet and has a detachable magazine with two more bullets inside. You have to start in the air to see them, so...yeah... Anyway, the gunsight does work and yes, it is supposed to look like there are teeth, spikes, and scales all over the gun. Hope you enjoy! Credit to @TheDerpyDude for the original gun and the inspiration to make this!