This is a White Paper from ATF explaining that AR's and AK's should be considered sporting rifles and also that silencers should be reconsidered as legal...Probably never in Cali though.
http://apps.washingtonpost.com/g/do...the-white-paper-on-firearms-regulations/2325/
http://apps.washingtonpost.com/g/do...the-white-paper-on-firearms-regulations/2325/