I sent an e-mail to Amber yesterday asking if I could have a weapon with two different barrels (i.e., .40 S&W and Sig .357) on my permit and she reported back I could. She said I could either list it as two weapons or list one weapon with both calibers. She then responded to a follow-up question and said I would need to qualify with the same weapon twice with both barrels since it technically becomes a different weapon when the barrel is changed.
I've read in other counties where they require that everything on the handgun must be original with no laser sights, etc. Makes me glad that I'm in Sacramento County!
Edit: Here is a link to a separate thread on this matter with a post that includes the quoted response.
http://www.calguns.net/calgunforum/s...7&postcount=10 I also report later in that thread that my CCW did arrive with both calibers listed for that weapon.