Here is the page on the Browning website to date the BSS...

http://www.browning.com/customerservice/dategun/detail.asp?id=26

And here is the page to select other models in case the route back is not obvious.
http://www.browning.com/customerservice/dategun/

Mark Begich, Joaquin Jackson, and Heller resistance... Three huge reasons to worry about the NRA.