rmc51
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Barrels and Bullets: Conventional Versus Polygonal Rifling
The bore of a gun barrel with conventional rifling is etched with corkscrew-like cuts. Each cut, or groove, is separated by a ridge of metal called the land. Together, these grooves and lands define t...
bearingarms.com
All conventional rifling is formed by cutting or exerting pressure within the barrel, unlike polygonal rifling which is formed by hammering the barrel from the outside.