If you have no beamshots, you should at least describe where exactly you see those rings!
I just checked mine, until now I haven't seen any rings in real use. Shing at the ceiling, I get a bright and huge plain hotspot, surrounded by a bright spill, no rings in there and that's the usable part of the beam. Because of the TIR, there is not much brightness in the corona, the spill ends more or less cut off and the dim corona is indeed full of rings, which I barely see, beause it's so dim compared to the hotspot and the spill.
That's what I call a normal beam for a TIR, you concentrate everything you get in the center of the beam and don't care about the dim light around, it's enough to let you see what is around, but it isn't really usable.
Are those the rings you are reffering to, or do you see some in the hotspot/spill area, where you shouldn't see any?