The CMMG Drop In .22 LR AR15 Conversion Kit will give you all the features you want your rifle to have in California with none of the jail time. Not to mention, shooting for 3 cents a round.
Lone Wolf Distributors, AlphaWolf Barrel, 9MM, Salt Bath Nitride Coated, Fluted, 416R Stainless Steel, Conversion to 9mm Stock Length, For Glk 23/32, Made in the USA