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So why would Glock invest the time and energy in making .45 ACP guns stand up to 10mm pressures. It just seems odd.
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The G20 (10mm) came out first. They just kept things the same for their next gun, the one in question here: the G21. They saw that it would make an acceptable platform for the .45acp and wouldn't cost them tons of money for new molds, parts, etc.