Quote:
Originally Posted by TAC
It sounds like Polygonal Rifling. Something Smith and Wesson learned from Walther.
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It is not polygonal rifling and its use pre-dates Smith's association with Walther. It is conventional in every regard except that the transitions from groove to land are rounded rather than sharp-cornered. See Pisgah's post for exactly what ECM rifling is.
Adios,
Pizza Bob