I don't know if we have any Mk.23s in California, im pretty sure they come standard with a threaded barrel, and that is a BIG no no down here in SoCal. Unless there are non-threaded barrel variants. I have a couple .45s that my grandfather owned(Including his 2 star general 1911), though they are in my fathers name, so I know the power of a .45 well enough. I'd just thought of getting a 40 S&W to try it out.