This guide details the experimental modification of an HM Defense HM50B .50 BMG rifle's barrel, as demonstrated by Matt Carriker of Demolition Ranch. It covers the process of progressively shortening the barrel using a DeWalt chop saw, measuring the impact on muzzle velocity with a Caldwell chronograph, and observing changes in projectile performance. The guide emphasizes the importance of ATF compliance for such modifications and highlights the experimental nature of testing extreme barrel lengths, including a 'negative barrel' scenario.
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