I have seen the loose ejector rod situation on at least two occasions, a squib more than once and high primers as well as dirt or degree under the ejector star. On two occasions, I saw a damaged firing pin bushing that was not seated where it was supposed to be. When fired, the primer backed out into the hole where the bushing is and hung up the revolver. In both cases, the bushing needed replacement and in one case the S&W could not be fixed because the hole for the bushing was elongated.That was my .357 Mtn Gun. I had purchased it a a very good price and had not fired it in the several years that I owned it. The first time to the range, this happened on each shot. I had to force the cylinder opened. It could not be repaired and had to have the frame replaced.