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Old September 1, 2014, 10:34 AM   #7
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 8,927
Polygon rifled barrels cost half as much to make than other types once the barrel blank is gun drilled to some rough bore diameter. That's why they're popular in many service rifle barrels. But they've yet to equal the best of button, broach, hammered or cut rifled ones for accuracy.
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