Something else to be aware of with 624's is that there was a recall on the earliest production models due to some non-spec bar stock that had been used on at least one(1) 624 cylinder. The recall was to verify the proper alloy, from which following a successful outcome they would be shipped back to the owner with a red circled "c" stamped on the original box. I don't know what happened to any that didn't pass the "sniff test"; from what I can recall there were not many (if any) that had been shipped that failed. There have been several threads posted here on this issue. As others have said, they are great guns nonetheless. -S2