I bought my GP100 last December. I had to send it to Ruger within 2 weeks because the cylinder suddenly stopped rotating while firing. I couldn't even pull the trigger back more than 1/2 way. They returned it with a note that the ejector rod was replaced. I fired it many times without issue from winter through springtime at the range, and then put it in the safe for a couple of months. Today while at the range, after firing about 75 rounds (.38 and .357) it jammed up again. The same exact issue as the first time around. Something is happening as the barrel and cylinder heat up. There is obviously an unacceptable degree of expansion that is literally locking up the cylinder. I'm no expert, but this is kind of ridiculous. I have 4 S&W revolvers, and have never had an issue with any of them. I bought the Ruger after a lot of research, and tons of positive reviews and opinions. And I totally agree it's built like a tank. But.... I see a lot of other posts on other forums regarding this issue. It's not just with my gun. I am hoping Ruger does the right thing and gives me a new one. I now have zero confidence with this one. And that's a bad thing for sure. Does anyone have an answer as to what is causing this?