Same thing happened to me. I also thought I had purchased a later model where the problem had been corrected. I was wrong. The LGS ended up sending it back to Ruger for me. Pretty good turn around time. Can't recall what they ended up doing, I believe it had something to do with cleaning up the chamber. It runs fine now, and is a nice shooting gun. Try the Ruger forum, there's a lot of info on the SR 762 over there.