I have looked at the rules online, but don't see anything about barrel length. Is there a limit? Can I use my 6" barreled M19? My 5" Webley? (I'm actually giving some thought to using the Webley sometime, btw.)

Also, I saw in the holster requirements that a couple of exceptions were made for "the single action category" but saw no other mention of such a category under "Equipment". Is there a single action category?