Originally Posted by vytoland

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. This affected the 586 (-0 and -1) and the 686 (-0 and -1) and their fixed-sight variants (581, 681). Later engineering changes for those models (586-2 and on, 686-2 and on, etc.) had the modifications incorporated into the design