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Poly Throwing Rifling

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As we learned in this week’s article, it shows how lead projectiles preform inside the barrel of a Glock and other barrels of the polygonal rifling type. What is a polygonal rifling? The best way to explain it as it relates to firearms is, in a rifling there is slight rise in the rifling and tighter twist in the barrel. The befit from the polygonal rifling is less bullet deformation, higher average velocity and a bore that is easier to clean. Alongside polygonal rifling, the bullet grips tighter to the rifling and creates a tighter gas seal. The disadvantage of a polygonal barrel is with traditional lead bullets, their softness tends to be oversized and leave lead behind above the rifling. Among the slight rise in the polygonal rifling,
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