The 586 and 686 (with the 1 piece barrel) have the sights machined with the barrel, so the front sight needs to be machined off. Although my 4", I forget the dash number has a pinned front sight.

The 586 w/patridge front sight, and the 6" and 2 1/2" barreled 686's, all had the sights milled off.

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MFWIC
DILLIGAF

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Nice try means you suck spelled different