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Yeah, but it must be cool eh?!
No it's not cool, and the ATF will hang you out to dry if you get caught even if it is accidental.
Any semi-auto can go full auto with a worn sear. I have never heard of any 3rd Gen S&W going full auto as characteristic of either the design or the quality of parts. 3rd Gen autos were generally well made. In fact the West Virginia State Police just placed an order for the Third Gen 4566 TSW .45 ACP pistol.
I heard this at the range from th e a glock armorer.
My 6906 doubled on me after about 40,000 rounds. I gave it a complete disassembly and cleaning and the problem was solved.
Questios: Did you ever replace the sear? How tight was the gun after 40,000 rounds and were you using the original recoil spring? How much wear on the barrel, if any?
Same sear. I have replaced the recoil spring several times. Slide to frame fit reasonably tight for a well used stock gun. No appreciable barrel wear. I intend to replace the hammer and sear just to be safe.