Old Stony - It was a private transaction (FTF) no laws against it (yet).
It's funny - Black Powder hasn't been overregulated- in CA, like they've done with modern and C&R firearms (as of Jan 1 2014 in CA there is no difference between a gun that's is 5-days old and one that is 50+years old. The only you can get around the 10-day waiting period is having a C&R Lic, plus a COE).
I'm sure in time they'll overregulate black powder as well!