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Old December 20, 2012, 12:20 PM   #13
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Join Date: February 2, 2008
Posts: 3,150
Just look at one. S&W started using this "modified polygonal" rifling about 1996 to 1997. At least in certain models. It's not like the rifling in a Glock barrel but it is not cut rifling in the traditional sense. It looks like it was formed around a mandrel. The walls between the grooves are angled, not perpendicular to the lands. They refer to it as "polygonal". There have been several articles published about how the rifling will not stabilize a cast slug unless it is a fairly tight fit. Mine seems to work well with cast and jacketed slugs.
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