What is it that I'm missing here?

How then, are people able to use pre-ban Glock 17 and 18 magazines in a Glock 19????
Isn't this illegal? It protrudes from the grip.
Does "outside the pistol grip" mean that the magazine and mag-well is not in the grip at all; that the magazine and mag-well is forward or rear of the grip (I think I just answered my question)?
Thanks, and I apologize for the dumb question. I haven't seen it discussed, which makes me feel like this guy:
How then, are people able to use pre-ban Glock 17 and 18 magazines in a Glock 19????
Isn't this illegal? It protrudes from the grip.
Does "outside the pistol grip" mean that the magazine and mag-well is not in the grip at all; that the magazine and mag-well is forward or rear of the grip (I think I just answered my question)?
Thanks, and I apologize for the dumb question. I haven't seen it discussed, which makes me feel like this guy:


draco has threaded barrel. but according to calguns chart that's illegal..
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