Feinstein has yet to introduce any legislation on an AWB, but in the house, there is already H.R.138:
Latest Title: To prohibit the transfer or possession of large capacity ammunition feeding devices, and for other purposes.
Sponsor: Rep. McCarthy, Carolyn [D-NY-4]
Cosponsors: 1
Latest Action: 01/03/2013 Referred to the House Committee on the Judiciary.
http://beta.congress.gov/bill/113th-congress/house-bill/138
Here is something you can sink your teeth into now!
The judiciary committee:
http://judiciary.house.gov/about/members.html
Ping for reference