![]() When I first got my G20SF I didn't know the reasons why it was safe so I bought a 40 S&W conversion barrel. Additionally the extractor only needs to hold the case from moving forward against the force of the firing pin for milliseconds until the primer ignites and the fired case is forced backwards against the slide pushing the slide rearward where the ejector ejects the fired case.Īdd to that the fact that case head dimensions of the 10mm and the 40 S&W are identical and the extractor fits the cartridge exactly. And since the cartridge headspaces on the extractor instead of the case mouth it is no less "Safe" than firing a 10mm cartridge that is out of spec and also headspaces on the extractor rather than they case mouth. It's safe in a Glock because the shorter cartridge headspaces on the extractor and the Glock has an extractor that grips over 1/3rd of the rim and is quite robust and it is spring loaded. ![]() ![]() Click to expand.Yes it is safe, but it's important to understand WHY it's safe and not just get someone's speculative opinion on the matter
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