Armyphotog: The AAL sn prefix would correspond to 1982, and that would be correct for a "no dash" 586 - they were introduced in 1981 and the 586-1 came out in 1986. If there is no "M" stamped in the crane area, the gun has not been sent back to S&W for the recall of no-dash and -1 586s. The original design of the firing pin and bushing allowed the cylinder to bind under certain conditions and loads. I believe the guns can still be returned for the modification that will correct the problem at no cost to the owner - may not be important for a range gun, but if you plan to carry it I would strongly recommend that you send it back.
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