Tragedy Averted - We Had a Misfiring Gun in Class

Published on August 18, 2025
Duration: 13:01

This video details a critical incident during a firearms class where a custom-built pistol, featuring numerous aftermarket parts, experienced unintended discharges. The instructors meticulously troubleshoot the issue, identifying tolerance stacking and specific magazine fit as the likely culprits. They emphasize the importance of testing aftermarket components and the potential pitfalls of combining non-OEM parts.

Quick Summary

A firearm malfunctioned during a class due to tolerance stacking from aftermarket parts and specific magazine fit issues. The gun discharged when magazines were seated forcefully, particularly metal MetGAR magazines, likely due to an over-inserting issue that loosened the ejector.

Frequently Asked Questions

What caused a firearm to misfire during a class?

The firearm misfired due to a combination of factors, primarily tolerance stacking from numerous aftermarket parts and a specific issue with how metal MetGAR magazines interacted with the firearm's ejector, causing it to discharge upon magazine seating.

How can tolerance stacking lead to firearm malfunctions?

Tolerance stacking occurs when slight dimensional variations from multiple aftermarket parts accumulate. This can result in components not fitting or functioning correctly, leading to issues like unintended discharges, failures to feed, or failures to eject.

Why did the firearm only misfire with metal magazines?

The firearm only misfired with MetGAR metal magazines because they appeared to be over-inserting, causing the ejector to become loose. Polymer magazines did not exhibit this behavior, suggesting a difference in their dimensions or interaction with the firearm's internal mechanisms.

What is the recommended troubleshooting step for firearms with aftermarket parts causing issues?

If a firearm with aftermarket parts experiences malfunctions, a key troubleshooting step is to reinstall original equipment manufacturer (OEM) parts. This helps isolate whether the issue stems from the aftermarket components or another problem.

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