Videos tagged with Barrel Autopsy

This expert guide details a comprehensive 'barrel autopsy' procedure, as demonstrated by the School of the American Rifle. It covers essential checks including thread concentricity, material identification, magnetic properties of the extension, erosion gauging, bore straightness, gas port alignment, and headspace verification using specialized gauges. A critical borescope inspection revealed a manufacturing defect: a smoothbore barrel lacking rifling, highlighting the importance of thorough inspection regardless of brand or price due to potential quality control lapses.

This detailed barrel autopsy on a Rosco Manufacturing 10.5" 5.56 NATO barrel reveals its performance after 26,750 rounds of full-auto fire. While throat and headspace remained surprisingly good, severe muzzle and gas port erosion were identified as the primary causes of accuracy degradation and keyholing. The inspection methodology highlights critical wear points to assess barrel longevity.