Well, Don, a cult gun HAS to be at least common enough for a cult to form around it.
TW said the Remington 17-but, JMHO, there aren't enough of them around for it to truly be a cult gun. If there aren't enough examples for the cult to worship, it becomes a "siren" gun-one you can't, or won't own.
Maybe a 17 isn't a good example of that, but, a Fabbri might be.
I also question the out of production part-The Thompson center single shot pistols have a well developed cult, and are still very much in production. The other aspect of cult following is something not everyone wants to be a part of. I don't have/need/want a Thompson center, or half a dozen different barrels for one. But, those centerfire single shot pistol guys are indeed a cult if ever there was one.
Best,
Ted