Note: the flash removal is not from the recoil spring. My bad! It works fine. Well, I pulled the trigger and bought a Gen4 G17. I can say without a doubt that without any additional backstrap it fits my hand like a glove. Win! I pulled it apart for a first cleaning and noticed that some of the flashing is gone where the recoil spring contacts the frame (see pics). I've seen this on some HK P2000s and IIRC a USP Compact. I'm am correct in assuming that I shouldn't worry about it on this Glock? Did I mention that it fits my hand like a glove?