I've read a number of threads in which 1911Tuner discusses the small radius firing pin stop so I figured I'd try one in my Kimber. In the process I discovered that both of my Dan Wessons have factory installed small radius firing pin stops (shown on left). I ordered a Wilson Combat Square Bottom Firing Pin Stop last week and it has a tighter fit in the Kimber slide compared to the large radius Ed Brown stop I've been using (center). The firing pin wasn't clocking much, if any, but now it's even less able to rotate. 1911Tuner has mentioned an ideal radius of around 0.063" on the bottom of the firing pin stop so I had that number in my head as I got to work. I shot the pistol today and my first impression is that the pistol feels "better" under recoil. Case ejection feels like it's been smoothed out and is less "snappy". Also, muzzle rise under recoil is definitely reduced and I felt a noticeable difference in the speed of follow up shots. The pistol has been very reliable but now it just feels ... better. 1911Tuner has made the point that he's all about reliability and that the reduction or change in felt recoil is a secondary benefit. All in all I'm very pleased with the changes and will upgrade my EBs with this simple little piece. Thanks 1911Tuner for the tip.