For the Browning, I believe Talley makes the best quality 20 MOA rail. For, rings I would go with a set of aluminum Seekins, Leupold Mark 4, Nightforce UL, etc. But, I would definitely go with aluminum rings since the only bases available for the Brownings are aluminum. The Burris signature Zee rings are a popular choice as well.
This is the rail. http://swfa.com/Browning-C3303.aspx