I've had one AD in shooting hundreds of thousands of rounds. NEVER WILL or IT. No one hurt, no property damage, and believe it or not, not entirely operator error. Firing a Smith 586 with 357 rds., I had fired several without problem, then I got one that fired, but it locked up the cylinder. I attempted to open the cylinder, also tried pulling the trigger, hard. No go, so I attempted to DA the trigger while turning the cylinder with my off hand. That did it alright, the thing freed up and boom. This was a 586 no dash, and was later recalled by Smith for exactly that problem. Something to do with the hammer nose(firing Pin)and its bushing. I sold the gun a few months later, the recall occurred after I had sold it. Same thing was occurring with LE guns shortly after the 586/686 was introduced. Apparently, primer metal was flowing back into the bushing recess and creating this problem. The fix for this did not occur until the 586-2 production was out. Scary, but following the rules of safety, no harm done except for some powder burns on my off hand from the barrel/cylinder gap. There is no luck involved in proper gun handling techniques. Stay aware.