Videos tagged with Index Pin

This video details the cause of a 'clocked barrel' in a PSA upper receiver, which is the barrel rotating within the upper receiver during barrel nut installation. The issue stems from improper fixtures not holding the upper and barrel securely, allowing the barrel index pin to peen over the receiver material. The instructor recommends using the correct tools, such as Midwest Industries rod, to prevent this common assembly error and ensure proper alignment.

This video demonstrates how to identify a 'clocked' barrel extension in an AR-15 upper receiver, a common issue arising from over-torqued barrel nuts. The instructor highlights visual cues like misaligned feed ramps and explains potential causes, including bent index pins or manufacturing defects. The guide also suggests a practical test using a handguard to confirm the misalignment.

This guide details the proper techniques for assembling AR-15 upper receivers, emphasizing the correct tool selection to prevent damage. Instructor Chad Albrecht of School of the American Rifle highlights the critical importance of using tools that engage both the upper receiver and barrel extension for barrel nut installation, and barrel-holding tools for muzzle device work. Improper tool usage can lead to catastrophic failures like sheared index pins and unthreaded barrel extensions.

This video from School of the American Rifle showcases several problematic AR-15 components submitted by viewers. It highlights issues like bolt separation at the cam pin hole, case head separation in a 9mm barrel, a broken upper receiver due to improper tool use, a damaged barrel from attempting to remove a front sight base, a malfunctioning nickel boron bolt carrier group, and a barrel with a pin drilled into the bore. The instructor emphasizes the educational value of these failures for future classes and promises follow-up videos on diagnosis and repair techniques.