So I've been shooting and carrying Glocks as a primary handgun for about 10 years now. I've always favored the compact frames and have bounced around from G19s to G23s to G32s and back to G19s again. I never understood why everyone was always complaining about "Glock knuckle", frankly because I've never had an issue with it in the slightest and always thought it was just people with overly sensitive hands or something. After playing around with one of my buddies M&P9 FS over the last several months, I finally decided to pull the trigger and buy one at the end of December because, like most, I thought it felt ergonomically superior to Glocks. For a few weeks my Glocks spent their days and nights in the safe, abandoned and abused, neglected, and sad. I just didn't have enough time to spread between them all, and needed to get aquainted with my new toy. At nights I always spend a lot of time dry firing and fondling whatever gun I happen to have with me at the time, it just so happened to be the new M&P every night for quite a while. A few weeks into this routine, I started to notice the inside of my middle finger knuckle was developing a fairly painful callus. The more I fondled the M&P, the more it would hurt and swell. I decided to grab one of my Glocks to see what was going on, and lo and behold now my knuckle hurt when gripping my Glocks too! This was obviously no good, and at first I couldn't believe the ever-so-comfortable M&P was guilty. I was in denial, and continued in my ways, only to make matters worse. I eventually realized this was not working out and had to make the decision that for whatever reason the M&P was just not a great fit for my hands. Maybe I'm weird, maybe it was the Glock Gods punishing me for my sins. Either way, the M&P had to go, and after only a few hundred rounds through it I made the decision to end our relationship and sell. For the past week I have been in recovery, using a file several times a day to try and remove this darn callus that has been bothering me. It's almost gone at this point and I am back to the comfort of my quite "uncomfortable" G19 compact frame. It's kind of ironic that I finally figured out what "Glock knuckle" feels like, although from this day forward it shall forever be referred to as "M&P knuckle". Bet you won't hear anyone else with this crazy story... but you gotta admit it's still kind of funny.