I once owned a Glock 27, that didn't fit my hand. Shooting more than 50 rounds at a time would wear a blister on my trigger finger which was in contact with the frame at the top of the trigger guard. I now own an XD, which fits my hand like a glove. Glock makes good guns, but not for me.
Same thing with me. I bought the G23 and after about 50 rounds my trigger finger was hurting. I never had that problem with my XDm or M&P just the Glock. I smoothed out the internal thinking that was the problem and it didn't help. So I switched it it with a M&P, now my finger feels normal again when I shoot.