Another thread got me thinking: (Yeah, I know, that's dangerous!) I'm using the smallest grip (no additional backstrap) on my gen 4 G27, and am placing a few shots low. Something just feels off, like maybe my final trigger pull after the reset, is just too long. Had been doing pretty well with my Gen 3 G17. I have the "-" connector and NY1 spring in both guns. Sooo, beside the obvious difference between a 9 & a .40, and a slight weight discrepancy, grip circumference seems to be the biggest difference. Could the smaller grip make it seem like I have to pull the trigger back farther before the shot? I think I'll put the small backstrap back on and see if that feels better & improves my 27's performance.