As a Kalifornian, I kept up with the whole off list lower thing. I didn't even send one in to eventually get registered for MYSELF because I was worried about the whole legal thing. After a couple of months, I eventually got the fiancee to buy one.
As long as it's not on the list and doesn't have any of the features, it's fine. A lot of people, even cops have been doing it. This is for real, and it's legit.