I remember in CA , we need to have a "off list receiver" and have a fixed magazin with no evil feature or a detachable magazine with NO evil features
i remember the federal Assault weapons ban states that some bushmaster models ( bushmaster XM15 to be exact)
but different state might vary, gun law in california is stupid and unreasonable . These law really keep me away from buying a .223 AR15 i am going for .22 SW MP-15-22 or ruger 10/22 instead