In California, and most other states, fully automatic weapons are not legal for the regular citizens. Not sure why, but not the place or time to discuss that. Converting your weapon to a "true" full automatic solution comes with heavy fines and possible jail time. In other words, don't do it. With that said there is a company, Slide Fire Solutions, that makes a kit which will make your AR-15 or AK-47 act like a fully automatic weapon.
So how is the Slide Fire Solutions SSAR-15 and SSAK-47 replacement stock that makes your gun act like a full auto gun legal? "By definition, the SSAR-15 and our other products are not adjustable stocks or trigger manipulation devices. Slide Fire products have been approved by the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE)," There you have it, the ATF folks say it is legal, so it is, In my opinion, this can't last forever, but should, so stock up.
How to convert your AR15 to fully automatic. Enough talking, you have to see the Slide Fire stock work. Watch the Slide Fire video after the break.