G3OSGlobal Observing Systems of GCOS, GOOS and GTOS
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The G3OS is a much more compact pistol, and while you might regret having "only" 10 rounds in a magazine, you can always use G21 magazines as reloads.
While I didn't have a G30 or 30SF to compare it to, by my calculations the G3OS slide could be as much as 5.
That weight loss would go a long way to explaining the snappy recoil I experienced and is something you might want to be aware of if you are considering the G3OS as your main carry gun.
As for accuracy, I suspect the accuracy experienced by most shooters will be more influenced by the recoil than by the inherent accuracy of any given G3OS.