From what I read on the internet (of course -- all true), only Gen 4 Glocks with full sized grip will have beavertail back straps.
Could a Gen 4 19 not have the notch because it was not meant to have a beavertail backstrap?
My Gen 4 Glock 34 and a Friend's Gen 4 Glock 17 have the square notches but did not come with the beavertail backstrap.
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