S&w 686-1

[Caleb]

Hmmm.... I didn't see any other "M" besides that one.


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[Razorwire]

http://firearmsid.com/Recalls/FA_Recalls%205.htm

I really think you're good to go. Above is the link to the S&W recall information. Hope this helps.

[Caleb]

I believe so too. It states in that link that the "M" should be stamped "above" the model number in the crane. Mine is stamped in front of the model number but, since these do not come with a letter before the model number.....I believe mine was retrofited with the new part.