Hello
I had one for a very short time span. I had swapped a Model 629 for it, but shortl;y after getting it, I heard they had cylinder issues. I called S&W service about mine, and they confirmed it had been back and checked by them, once I provided them with my serial number. I was told there was Two different reasons they recalled them, one being that the vendor over Bored the cylinder which would allow the Insertion and firing of a .44 Magnum round , which would have been a disaster because the model 624 Cylinder is NOT heat Treated to the same specs as the model 629 in .44 Magnum. The Other reason I was told that they had soft cylinders that did not get the right amount of Heat treating applied to them and they could Possibly Burst if loaded and fired with Warm Hand Loads. I looked into it, and S&W did NOT have any spare cylinders for this model. Mine had a Red Circle on the box about 3/4" In diameter which was supposed to show the revolver had been back to S&W and Inspected by them. Bad part is, if you buy a used one with No Box, They never marked the gun with any kind of Inspection stamp, so you would not know if you got a Problem child. I was Leary of mine, so I asked for S&W to send a Letter of Inspection to me, which they Inserted in all the factory checked box's but mine was missing the one that Came with it. When it showed up, I swapped the Gun off, and never looked Back..Be Careful about your used model 624 purchases. Hammerdown
