here is the direct link to Weigand but you can also try Midway, Brownells, andNatchezz. I'm sure others have it too but Weigand also has a discount if you buy the rings with the base and I believe they have three ring sets. If it is the scope I haven't dealt with Bushnells customer service but most optics companies seem to be pretty decent to deal with. I'm trying to remember where I saw the full length base at but I'm drawing a blank. I'm sure someone on here that hasn't been taking pain meds knows which one I'm talking about.

http://www.jackweigand.com/Redhawk_Blackhawk_Bisley_Hunter.html

I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them. John Wayne-The Shootist