The cut out bothers me a lot - with my small/medium hands my pinky rests right inside it on the G19 - with the new G45 and Gen 5 MOS models it looks like Glock has made a "rolling update" and the newer Gen5 pistols should have the cutout deleted - I hope you get a new production model -
I'm glad I waited on the Gen5, first they beveled the frame to match the slide, and now they deleted the cutout, my 2 biggest gripes on the Gen5 pistols