Black Hole Weaponry has established a prestigious and unprecedented benchmark for excellence in barrel manufacturing with our proprietary rifling and stainless steel. Caudle 3-land polygonal rifling that consists of a series of arcs, which is held in very high regard for its accuracy, increased velocity, reduced gas cutting, and ease of cleaning. We only use a tightly controlled blend of fully-vetted and certified, F-Bar rated, BOSS 416R steel, recognized as the finest ordnance steel available. (less)