I've commented on this before.
1000 rounds through mine, never a failure. Minor peen at front of barrel block. Not really a lip (less than 0.5mm at the most), or if it formed at one point, it wore down from the slide. If I look straight at the front of the barrel block, it is banged in, and a little and shiny. Does anyone else with minor issue see this wear right across the front (with or without a lip forming)??
I don't really see chips or other damage on the ears like some people discuss, but I see wear at those points as well.
I am waiting for a response from Ruger about what degree of this is acceptable...email and phone messages left, and i will let you all know. If mine doesn't continue to get worse, i can live with it. It works.
I will try to submit a photo tonight. I think we all need to submit photos here to get an idea of the variation out there. We need pictures of the good, the bad, and the ugly.