Hey bodyarmorguy, the 659 you have is not an RSR "transitional", the RSR models all carry an RSR serial prefix, and are stamped 6590. They were actually made in 1991, I believe, much later than the introduction of the 5906. Yours is a true transitional, or "interim" model, which were all built/shipped in late 1988, and are all stamped 659 on the frame, even though the box is labeled 6590. It appears some have second gen ambi safeties, and some have third gen, but they all feature third gen dovetailed front sights. Purportedly only around 150 were built, I own four of them, and they all have second gen ambi safeties, even though the serial numbers on mine are earlier and later than yours, although I have seen them both ways. They also all have the TBU, TBV, and TBW prefix, and possibly TBY, though I haven't seen one yet. Here's the flyer....and all share the same spec ord numder of 1408 on the box label, and notice the product code of 104001, you can look that up in the SCSW under model 659....
