Did you see the new Disneyland Launch Bay props on MSW? It says Chirrut'a Lightbow is a traditional weapon built by the Guardians of the Whills. I don't remember this being in your meta so thought I'd let you know.
THIS IS COOLTASTIC much thanks nonnie! I hadn’t seen it. Pictures are [here].
So apparently the Lightbow is “a complicated form of bowcaster native to Jedha and the traditional hand-crafted weapon built by the Guardians of the Whills.” It’s a pretty interesting name for a weapon, too. I wouldn’t be very surprised if there’s a crystal somewhere in that thing. Seems likely that Chirrut could be a Guardian himself, though even in the Jedha pages of the Galactic Atlas [here] , where the Temple of the Whills’s name was first revealed, he’s called a “warrior monk”.