[Suzerain of Sheol]

Hmmmmm.... it's been so long I can't remember that well. We got two guns from the Phillipi encounter, I believe, Michael got one from the artificer guy that could channel the wielder's psychic power to increase the damage its bullets dealt and hurt incorporeal creatures. Then the priest had the golden revolver he was hiding in his ridiculous smuggler's Gospel that presumably was consecrated, letting it deal normal damage to demons and undead (especially useful against Dybbuk since it would get around having to totally dismember them to take them down.)

Was it one of those? I can't think of any others we found, but maybe my memory's failing me. Either way, since we're rebooting, we can edit the details a little in cases like that if you have something else you'd like.