They make the 45 and 44 bisleys stainless adustable sight in 5 1/2 there a limited run gun but there are still some availabe on gunsamerica. going price is about $450. I have both of these and there sweet guns!
I have one of the .45 Colt SS Bisleys. One or two limited runs. 5.5" barrel. Also made a run of .44 mag. Very nice.
I don't believe Ruger made a SS NMBH convertible, but they did sell and fit a spare .45 ACP cylinder to an SS NMBH. I had several SS NMBHs rebarreled from 7.5 to 5.5", with .45 ACP cylinders. Call Ruger to see if they will still do it.
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