Need some help from the CA gun owners. I am taking a job in SF. Not happy about leaving Seattle because we really love it here but the job is really good.

I have S&W M&P15T. If I make the stock fixed (A2 style) and change out the barrel for a bull barrel with no threading am I good to go as long as I only use 10 round mags? Or do I still need a bullet button?

Guidance needed please.

Thanks!