All the rough Rugers I've seen have been stainless; the very smooth ones have all been blue. I fixed the issue with one of my stainless ones by getting it NP-3'd; it's now slicker than snot. Black-T would have done the same thing if you like black.
You can also improve even the stainless ones a lot by knocking the sharp edges off the rear bridge and polishing the [bleep] out of the extractor (exposed long side, top and bottom), then, if you want, polishing the other friction-y areas like the extractor collar, tops and bottoms of locking lugs, top of the ejector, etc. A bit of dykem or magic marker will show pretty clearly what is rubbing what.
