High Capacity mags
In Arizona, we can buy 35 round Glock mags...Awesome...they're a little impractical for concealed carry though. Arizona has great gun laws and is an open carry state (okay to carry in holster as long as the gun is visible). Concealed carry permits are also prevalent in AZ.
I used to live in California, but never going back. Californians are lucky they're able to own a bb gun let alone a Glock, and if you ever have to use it, even protecting your own home, I hope you have a good attorney.
I like your Glock. I'm carrying a 17 (9mm), 17 +1 mag.