Hindu,
Although mine isn't a PC5906, it sure handles and shoots like one should. Karl Sokol did this one for me several years ago. He's done my 645 (no longer with me) and is currently doing my 659 (making it into a dedicated rail gun) and my 39-2 (making it more user-friendly by his high-grip mod and 1911-type grip tang treatment).
This 5906 was a former San Diego DA Investigator gun and was made in 1991. Karl did a de-horn, high-grip and grip tang modification. He also did the action that would make any Smith revolver guy/gal jealous. I think the DA breaks at 8.5 lbs and the SA around 4.5 lbs. Doesn't matter: It's S-M-O-O-T-H!
I did the grips thru ROBAR and have a 2 stippled Arched sets ready to ship from them next week. They do a wonderful job with their stippling process. The only thing left for her is to send the slide off to Novak's to have them mount a 1911 front dovetail Tritium sight. I do this for two reasons: 1.) Cause it looks good and life is too short for an ugly gun 2.) If it needs replacing, a .330 X 65 Deg dovetail sight for the 1911 is easy to come by and has many options (Gold Dot, White Dot, Tritium, Fiber Optic, etc.).
Karl Sokol is a good man who knows his way around the 3rd Gen. He has my complete confidence. Two other outlets you should look at are Cylinder and Slide and Novak's. Of the three, Novaks would in all likelihood offer the quickest turn-around-time.
I can't wait to see my 39-2 and 659. When I get them back, I'll send my 915-06 to Karl. I have a 1993-vintage 915 that I mounted a stainless fixed-sight 5906 slide to.
One last thing is that all of my guns (save the 39-2 for safety reasons) will have their operating systems made into de-cock only. Karl is doing the 659 whereas my 5906, 915-06, 6906 have been done by "Vito" at S&W. I buy the used spring-loaded levers from Numrich under the S&W Miscellaneous Section.
Hope this helps!