Going straight to knowledgeable people on AR. I just looked on the website and CZ USA does not list the 505 Gibbs in either 550 or BRNO 602 actions.

Question.......... Are there issues with the cartridge in the CZ line of rifles that caused them to drop the Gibbs? Or is it lack of demand?

I did find two from the same dealer listed on GunBroker.com. Suppose this is a hold over? No, I don't need one, but that never stopped me from buying a firearm before.

Where do you pick up brass?

sure they do -- you just have to look for it
http://www.czusa.com/data/downloads/common/Safari%20Classics%20Catalog.pdf

Well I'll be horn swoggled. That's a Texas term, ain't it?
I sure didn't see it on-line. I've read quite a bit here lately about this caliber including Ganyana and the last Sports Afield, and find it pretty interesting.

I kind of drool over their premium grade wood, but I suppose it should be in one of those Gawd awful soul less gray plastic abominations, not that I have an opinion.

The CZ 505s are nice. I have one and love it. No, it is not a 10K Ryan Breeding, but it is a 505. Brass is easy to get right now from midwayusa, huntingtons, or custombrassandbullets.