02-12-2015, 01:58 PM
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US Veteran
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Join Date: Jan 2014
Location: Aliquippa, PA
Posts: 1,400
Likes: 351
Liked 714 Times in 476 Posts
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I've heard of polygonal rifling. It's supposed to be more durable and less prone to fouling.
Here is what Bearing Arms has to say on it: Bearing ArmsBarrels and Bullets: Conventional Versus Polygonal Rifling - Bearing Arms
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