Thanks to Heiwa's guide "From Ripping to Working in-game"
Author's Comments:
My first attempt at porting from other games and minor texture editing.
This comically huge gun is the end result of me thinking that Heated Slug Shot looks kinda like Bullet Bills, that Splatoon's .52 Gal would make a good base for a Bill Blaster themed gun, and that if I smashed my head against my computer enough that image would leak out onto the screen so that I could unleash it to torment others.
Edit 1.1: Cut down the trigger. Edit 2.0: Now includes an option that conforms much more closely to the dimensions of the weapon this is being imported over. Still huge but not quite as much. The original version is kept as an option if you wanted to use it for some reason. Also closed gaps in the mesh.