Quote:
Originally Posted by 1075tech
I believe the "M" on the yoke was added in 1994 as it was returned to the factory for a timing issue. There was some type of modification they were making at the time that was common to the 686.
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It wasn't a timing issue. There was a "fix" in which the hammer nose, and hammer nose bushing were replaced due to sporadic lockups when using a certain type of .357 Magnum ammo, Federal to be specific. The "M" was stamped to show the gun had been retrofitted.
The fix applied to 686's, 586's, 681's, & 581's. Don't remember if it included the -1"s also.