California has a lot of restrictions on weapons, but there are still ways to build a rifle without breaking any of these local laws. Like with buying any other gun, it is important that you understand your local restrictions prior to starting on any project. From there, you will find that there are many companies out there that offer California-compliant options. If you want to work with the best, then the PWS MK1-California AR-15 Complete Lower Receiver is an excellent place to start.
Forged using 7075-T6 and treated with hardcoat anodizing, the lower was made to put up with its fair share of abuse. It features the PWS enhanced buffer tube to provide for the best handling. It also includes an adjustable stock and ergonomic grip designed to deliver under stressful situations. This is made with MilSpec components, ensuring you get the absolute best performance and also guaranteeing compatibility with any standard upper.
When you want to build your own AR style rifle but need to stick within the local California restrictions, then this lower is a great option to consider.