I have R9S #128. My dealer has R9 #127. I took both to the range for reliability testing. Through #128 I shot 50 rounds Sellier & Bellot FMJ, 50 rounds Blazer Brass FMJ, 14 rounds Speer Gold Dot 115g HP and 14 rounds Gold Dot 147g HP. I had a total 31% failure rate, all of them extraction failures. The extractor would pull the empty about 1/2 way free of the chamber then let it go, jamming the slide back (in the slide's attempt to strip a new round from the mag, the new round was trapped by the 1/2-out empty and had no place to go). The pressure of the new round against the empty prevented clearing the empty with a fingernail. No. 127 had a similar failure rate, all extraction problems.
We've sent both guns back to Rohrbaugh, who confirmed what I deduced: the magazines are too long (by only .002"). This I concluded caused the top round in the mag to press up against the empty coming out, which caused the extractor to let go since the horizontal plane of the extractor pull and empty was broken.
Don't have the guns back yet, but Karl insists we'll get 'em back working perfectly. I'll let everyone know.
Incidentally, the literature which says to change out the recoil spring after 500 rounds was printed before they changed recoil springs. Now it's either 4,000 or 4,500 rounds (I forget which). that would pretty much be a lifetime of shooting these guns, since I don't know anyone who would WANT to shoot 'em that much and endure the recoil!