Thanks OP for introducing me & others to this round, I picked up a 460 conversion kit too from Clark. Not to hijack this thread or anything...
Holy cow, the recoil spring sure made it tough to assemble! My thumbs are all raw...I might have to follow the alternate assembly instructions offered here next time:
http://www.realguns.com/archives/106.htm
Anyway, have yet to shoot it, will let you guys know how that goes...how does it look?