Polygonal Rifling - A further development of Lancaster Oval-bore rifling where, instead of an oval-shaped bore cross-section that spirals as it proceeds down the barrel, that cross-sectional shape is a soft hexagon, octagon or other multi-lobed shape. Advocated in the modern period by German manufacturer Heckler & Koch as offering slightly lower bullet resistance within the bore and consequently slightly higher velocities than with more common Enfield rifling.
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