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The G21 is the exact same platform/parts as the G20 which is a 10mm. The 10mm delivers much more pressure and punishment to a gun than the very low-pressure .45acp.
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I don't know anything about Glocks, I don't own one and I have never shot one but this seems like a curious fact. I am a lot more familiar with .45 Colt as opposed to .45 ACP and it occurs to me that while S&W makes .44 Mag revolvers and .45 Colt revolvers that look identical, they do not give the .45 Colt revolvers the same heat treatment and strength as the .44 Mag revolvers.
I assume it just takes more time and costs more than it is worth when the max pressure for .45 Colt is 14,000 psi and the .44 Mag is 36,000 psi.
10mm has a max pressure of 37,000 psi. .45 ACP has a max pressure of 21,000 psi. 10mm is almost double the pressure of .45 ACP. So why would Glock invest the time and energy in making .45 ACP guns stand up to 10mm pressures. It just seems odd.