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Old September 5, 2014, 06:59 PM   #20
B.L.E.
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 2,603
Quote:
Originally Posted by Jim Watson
Well, 5R is not "polygonal" in the Glock usage. It is what the old Brits (there they are again) called "trough shaped rifling."
Is this the "trough shaped rifling" you speak of?

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