<Ul> <Li> Luxembourg - Used by the Luxemburg Grand Ducal Police as duty weapon . </Li> </Ul> <Li> Luxembourg - Used by the Luxemburg Grand Ducal Police as duty weapon . </Li> <P> In 1987, seven years after the release of the Model 686, there were reports of cylinder binding with some types of standard . 357 Magnum ammunition for L - frame revolvers manufactured before August 1987 . S&W put out a product warning and authorized a no - charge upgrade to make modifications to the revolver, and as such all recalled and reworked guns were stamped with an M marking signifying they had been recalled and fixed, and thus it is known as the M modification for all 686, 686 - 1 and 586 - 1 and 2 Revolvers in the firearms world </P>

Smith & wesson model 686 plus deluxe .357 magnum 3 barrel