Thanks, gang. I will check out Down Range as soon as I get there. It had been my understanding that a new resident couldn't bring an AR into the state after Jan 1st, and as such have planned on leaving them in the Northwest, but if I can do as advised above, I will try to convert one or two with the new BB or make one featureless. I've gone through my stuff and have all pistol and rifle mags above 10-rounds set aside, so that won't be a problem.
I've visited Calguns.net several times in the last couple of months, though it seems a bit light on info for new residents after the most recent legislation. My plan was to bring almost nothing and leave everything in a safe at a property out of state, though if we stay in California, which we will for the foreseeable future, I don't want to forfeit anything I don't have to such as a couple of off-roster pistols that I frequently use by missing my initial window to bring them with me. Crime rates in the area are many time higher than we are used to, which also makes me want to leave most stuff behind.
I can't recall which shop gave me that info regarding barrels and the KSG, as I called three or four, though I believe it was a shop in Paradise. In another thread, others said KSGs were fine and another dealer on the same day said they were good to go. It's my wife's and she likes it, so if it's a no-go, please do let me know and we'll leave it out of state. She does have a VFG on it, which can easily be removed if that is a problem on a shotgun.