California law has labeled the AR platform as an assault rifle, they did this by saying any rifle with a detachable magazine becomes an assault rifle and is now banned by California law.
To get around this the mag release button can be changed to prevent the magazine from being detachable while the weapon is assembled. While this allows legal gun owners to keep their legally purchased property, it does make it a bit of a pain to use by slowing down and complicating the act of changing the mag.
Along come the Patriot-pin from https://patriot-pin.com/ In this video you will learn how to install both the mag lock button and the Patriot pin as well as how to effectively use both. Installing them is easy to do, and with a little practice you can become very proficient in it.
After you watch this video, be sure to check out the Full30 forum at https://forum.full30.com/?u=tactical_reviews it's filled with great people willing to help..