While I do have some sort of "handle" on the R9 pistols I built, to be able to put something directly on a certain serial number may be difficult, but, depending on the number, it may just jog my memory and we might have something viable. It would depend on the number and what I can remember about it. You are welcome to send me any particulars in reference to the firearm you have Phil, and I'll see what I can do for you.
Eric