Russell,

I believe that the Ruger is in Stainless only and Clark recommends a steel gun over a stainless steel one. They also have a list of reccomended guns and ones to stay away from. Of course this does not mean that the Ruger would not work fine, but I opted for one on their recommended list to avoid any unwanted surprises.

http://www.clarkcustomguns.com/rowland.htm

Here is a thread on the 1911 forum the has several posts by Craig that I have found to be very helpful.

http://1911forum.com/forums/showthread.php?t=187513&highlight=Bearbait+firing

I have purchased a Remington R1 and my kit, brass from Clark, and some additional parts from Brownell's are on the way.