This guide details how to use conversion barrels in Glock firearms, emphasizing the necessity of starting with a .40 caliber slide for 9mm, .40 S&W, and .357 SIG conversions. It explains the critical role of the ejector when switching between calibers, noting that it only needs changing when going from 9mm to .40 S&W, but not between .40 S&W and .357 SIG. The video demonstrates how conversion barrels are thicker externally to fit the .40 slide, ensuring reliability.
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