Ok... here are pictures of the PSA 9mm upper/bolt/lower that I have. It currently shoots Colt pattern mags no problem with a mag well insert also from PSA.
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I held the bolt up to a standard factory Glock G17 mag- the bottom of the bolt will not fit between the feed lips. The lower portion of it will- but is that enough? I have no idea. If I had a G17 AR lower I could probably tell you- but without that, I don't know how high the mag sits in the lower and where the bottom of the bolt would contact the top of the mag.
As it is, I'd guess you'd have to take off maybe 0.050" from both sides of the 'tab' on the bottom of the bolt for it to fit through the feed lips. I have no idea if further mods would be required.
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