I've been having a problem with my Gen 4 27 in which the cause became clear in the last couple of days. Whenever I shoot that gun I get a small bruise on the tip of my ring finger. I enjoy shooting the 40cal round because I like the additional recoil over my 26. I have never felt it was that much more, but I just liked the feel of the added power. I owned two XD Subcompact 40s that I liked, but when I would rent the 27 I found I enjoyed the Glock more. I gave one of the XDs to my oldest son and sold the other. My LGS had two 27s in the case. One was a Gen 3 with an EXO finish and the other was a Gen 4. They were both the same price so I opted for the Gen 4. In retrospect I feel I made a big mistake. I found out in the last few days that because of the shortened Gen 4 27 grip I need to make some sort of adaption to stop the gun from pinching me during recoil. Tonyparson suggested buying the old shorter mags and Peace Officer suggested putting an O-ring on the mag. Both of those are viable options, but a third option and the one I am most likely going with is to sell the Gen 4 and buy a Gen 3. Apparently Glock has had some growing pains with the Gen 4 iteration. Between erratic ejections and pinching fingers, I hope they get this sorted out with their future models.