My local gun shop has a PC 13-4 for sale. From what I've read it's the first run model with the porting on the barrel (not the rib), bobbed hammer, and eagle grips. It looked to be in very good condition. I know some people have looked for these in the past. If there's a collector trying to get their hands on one I believe the asking price was $900. Let me know if you're interrested and I'll see if they still have it.