I bought a set of "posa" mounts for an Unertl scope I picked up for a rifle. Super great guy to deal with. I have zero issues with the mounts, and I had to get the radius of the barrel to him so he could machine the bases to fit my rifle and not wobble around. Fits perfectly.
I'm thinking that a standard production rifle sight might be an even easier option to go with: no custom machining to fit an oddball rifle.