From S&WFORUM: The recall was for improper heat-treatment of the cylinder. The stainless steel is too soft, and may let go with hot loads. S&W was dealing with the recall by taking the guns in and putting in replacement cylinders. Unfortunately, another member, I can't remember who it was, whote on this forum last week that S&W has run out of the replacement cylinders. He was offered a 629 as a replacement, but turned it down because he already had a 629. So as of now, no fix exists. That member said that S&W said his would be okay as long as mild loads were used, because it had not given him a problem yet. Some members have written that the factory put a stamp on the box end label to identify repaired guns. I know of no mark on the guns themselves.
Supica and Nahas shows it to be made in the first half of 1986. Like "dachsund", I have an ACH10XX 4" and it was in the recall range. Smith was most accomodating and the turnaround was quick. The only problem is that Smith did not mark the guns that have been inspected choosing to identify the box only. If, as you say, there is no box, then you would have to contact Smith to determine it's recall status.
Problem with the cylinders and heat< I believe. If you have the matching box to the revolver and it has a 3/4 in red circle with a C in the center, the problem was corrected or didn't exist on your gun. If you don't have the box that came with the gun, the best way to check is to call Kate @ S&W and give her the serial # of the revolver. She will cross reference and get back to you whether or not your gun was in the group with that particular problem. Hope that it's
not. The secondary issue is that I'm told there are no more replacement cylinders. I'm not sure what they are doing to compensate for that issue. Whether it is a replacement revolver (629), replacemet value or a different cylinder...I can't remember. But others will surely chime in with better info. There was also a post on the forum not too long ago that covered this issue in greater detail. Best wishes.
saltydog452: If you're concerned about your 624 call S&W