The little pawl that turns the cylinder was defective. I knew the cylinder was a little tight but chocked it up to being new. S&W was very nice about it. Fixed it. They asked me what they could do for me. They did a trigger job on the 340 and I had a model 36 with a scratch on the cylinder. They put a new cylinder on at no charge. 5 day turn around on the 340. 6 days on the 36. I have owned more than a hundred of their guns. Got a little back on that one.