I have a 686-5 and M586-8
what does M stand for in M586?
I see the 586/686-1 had a recall where M was added when mod was made….the M in mine is part of model number
thanks Jack

Some L frames were stamped M as an abbreviation for “model”. With more space in the yoke recess, early 586s and 686s were stamped “MOD”.

As you know, the separate M apart from the model number indicated the hammer nose/bushing replacement.

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Alan
SWCA LM 2023, SWHF 220