Don't expect any SBR or SBS in California.
Federal laws allow rifles to be as short as 28 or so inches in length with out a tax stamp as long as the barrel is 16"
California is 30" overall and no chance of getting a tax stamp.
Funny thing about the tax stamp is that the $200 was the price of a Thompson back in 1934 when the tax stamps came in to play. So a 100% tax was what you would pay to go full auto add another 100% tax for a less than 16" barrel.
45 ACP rounds actually are faster out of a 14" barrel than a 16" barrel. I thought about back boring my Marlin Camp 45's barrel so it would remain 16" but the bore wouldn't touch the round after 14" the velocity would increase.
AOW (any other weapon) is the only odd items available to own in California
https://www.impactguns.com/aow/ there's a $5.00 tax stamp on them. If I had cash to burn I would buy one for the novelty but I really like my wrists and don't need to spend the cash right now.
I wonder if my Sheriff would allow that on a CCW?