Guys,
I just got the rail from the link that SigKev provided. The seller was very prompt and easy to work with via email. Total cost was $65 deliverd to my door via UPSP.
It seems to be very nice. The finish is very smooth and even. No evidence of machine marks anywhere. Crisp clean edges, centered holes, it just looed great.
I had no trouble putting it on my PTR91. And after easing it into place and carefully snugging down the screws, I am very impressed. I like the way it locks over the rear sight base and is very snug, no evidence of sliding at all. I like how it is low enough to leave the iron sights usable, and that it doesn't interfere in any way with take down of the rifle. And heh, it even looks great.
Someone on HKPro whined that it may not be a real B&T because there is no B&T marks on it. Seller claims that the model number from B&T slightly varied over the years, but that this is a real B&T mount. Since I've never seen any other B&T product, I can't tell.
All I can say is that it is definitely a high-quality piece of work.
All I have to do now is find a set of rings for my scope. At some point I'll poke my nose back over here and let you know how it works.
Thanks for the advice. And thanks SigKev that was a great deal. BTW I think he said I got the last one.