Originally Posted by
txfireguy2003
Actually I was under the impression that it was just the opposite. Since it is based on the 10mm platform, but with a larger bore, there is less metal surrounding the chamber/bore. Same goes for the .40 cal as it's based on the 9mm but bored out larger. So I was under the impression that the .45ACP version was just a 10mm with thinner barrel/chamber walls, therefore inherently weaker. But that's just what I read, I'm by no means an expert.
Yes the G21 was based off the G20. But the 45 is a much lower pressure cartridge than the 10mm.
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