I would recommend the Leupold Dual Dovetail 2-piece base. I believe they are more secure, due to 4 screws instead of 3, which the 1-piece has. The rings are also more stronger and secure, because they twist into place instead of the rear being held in by the windage adjustment screws with the Standards.

Jon Jackoviak
The Optic Zone
www.theopticzone.com
[email protected]