Alright, after everyone NOT living in the De-United State of California gets done laughing at the fact that they are not required to have "tool operated" magazine release, an answer would be appreciated.  I am "temporarilly" in CA for work and after many swear words and what not I have added the bullet button to my AR's and purchased the appropriate 10 round wannabe 30 round magazines.  I was getting ready to buy a dedicated Spike's .22 upper and had the following question:

Is the bullet button still required on this?  I know the 10 round mag still applies, but was not sure about the magazine lock.  I saw a M&P 15-22 and the Colt version this weekend at a gun show and both models did not have the CA compliant bullet button.  I asked a guy about it and he said they did not have to have them, but I did not ask about a dedicated upper.

Maybe that rifle complied with one of the other idiotic rules instead of the detachable magazine rule, making is unnecessary.

Might want to check out the CA Home Forum

I *think* that rimfire is exempt, but confirm with CA residents.

No bullet button needed with rimfire