Started building mine up this afternoon. Feels and points fabulously with the small backstrap installed. Wearing my 7 or 8k round old OEM glock slide cut by fire4effect in their stingray pattern. Sights are custom Dawson Precision black rear/tritium front that cowitness with the direct mount DPP that lives on this slide, light is the XC1-B that I got as a warranty replacement for my original XC1. Hasn't let me down yet.
Internals will of course be 100% stock gen 4 glock 19 because I am not smarter than an Austrian engineer. Save for a Mayhem Syndicate Carry Comp + barrel that will be furiously tested.
And since I worry about such things when I start mucking with Glock's formula, sear engagement is essentially 100%.