Arnorer951 is right. The last two "j" frames I purchased this year (one was a 640 Pro Series) had to have the ratchets worked on. For the money I had to pay for them that's a shame. It didn't cost me anything to get them fixed but just the principle that makes me disappointed.
I had a m&p 340 that had a lopsided cylinder. ended up getting my money back, when you would spin the cylinder the whole gun would wobble. I bought another one though and it sits in my safe

with that being said I've bought a colt 1911 that was 1500 bucks and the finish on it was poorly done and they had to replace it, i think I have bad luck with firearms in general