Headcanons for Pistol Packin' Possum
(NOTE: These are working under the assumption that the Roger Rabbit graphic novel Resurrection of Doom is canon- and I don't see why not, since it's an official Disney publication that's yet to be contradicted- and that Pistol Packin' Possum is not in fact Judge Doom.)
-His guns fire wacky cartoon bullets that do a wide variety of things, similar to Hanna-Barbera's Ricochet Rabbit
-Judge Doom stole his gun to keep people off his trail
-After discovering that the gun was used to kill R.K. Maroon, he stops using that particular gun and starts using a new one
-In modern times, he becomes a proponent for gun control; because although he's a staunch supporter of the Second Amendment and a bit of gun nut, he abhors mass shootings and is especially sickened by ones that happen in schools and kill kids (toons always love kids)