I have a 425 and a 626 Onyx, but both of mine are 12 gauge guns. I've never seen a 425 with a blued receiver, but I've learned to never say what Beretta didn't make. Still, I think it more likely that you would have to go to the GR series to find one that is blued. It doesn't really matter, as they are basically the same gun. The GR series was just made for Garcia to import.
The 626 is my primary gun, and I have lamented the fact that they quit making them. I don't know that you can find a better mass produced SxS, but I wish there were more available in more configurations. Good luck finding what you want.
