I notice a discrepancy of sorts in the information provided in message #16 of this thread. The quoted Skelton article provides serial number ranges such as ADXXXXX, etc.; the info from Kate at S & W is nearly the same, ADXXXX, but notice the different number of Xs. The serial number on my 624 is AHTXXXX, which seems to put it in the "uh-oh" category if I interpret the Skelton info correctly, but leaves it out of the recall when using Kate's numbers. Who's right?