Are pistol stocks legal here?

[Telpierion]

Sorry, Gene; can't quote for you - but that is the case. SBR, in some states you can pay the tax.

I also belive that I've heard/read that a Luger can have a stock if it was original (as a C&R) but not a reproduction.

Same with Broom Handels and some other C&R pistols, but these may still be a no no do to CA's SBR laws. Though constructive possession should not be an issue there.