Hello,
I'm recently legally owner of a no-dash 686 model, four inches.
it seems that it was not being modified as recommended by the S&W company a few years ago.
(Not being stamped as a 686-M after repair.)
I have read that the recall/modification was to replace the firing pin bushing in the frame and the firing pin in the hammer to address an issue with some hot ammunition having thin primers which would flow back into the firing pin hole upon firing, binding the cylinder and making the gun unable to operate.
But if I compare the firing pin diameter between my 28-2 and this 686 for example, I do not see any difference.
(the firing pin bushing is similar too...)
Could it be that my 686 was modified without being stamped?
I point out that this revolver was bought in France.


Best regards