Edit- I guess it only the Rehawk (single spring) and Super Redhawk (two springs) that have different internal design and the Blackhawk and Super Blackhawk are the same based on post below. I want the Bisley in Blue with non-fluted cylinders and will have it cut down to around 4 1/2"
http://ruger.com/products/newModelBl...ey/models.html