I'd like to know the answer to the same question, if anyone out there has one.
Thanks for posting Racklover that very thought had been rumbling round in the back of my head for months, but I hadn't got round to doing anything about it.
Why did Ruger use a different sight for the 4" Redhawk?, it's almost like they cut down the longer barrel and then didn't have the raised portion to fit the usual Redhawk sight in.