What's the point of the "pinning" then? Just aesthetics?
Pretty much, probably just as many have C&P SEF frames just for the G3 look as those who just like the contoured grip.
Doesn't the real G3 come with both a paddle magazine release AND the push button? If so, why does the real one have both?
Yep, you'd have to ask Hk, though it worked out in their favor(and against ours) for importing.