I removed slide and reinserted slide stop, checked clearance with empty mag and loaded mag and pushed rounds out one at a time with both std mag and Pro mag. There was no difference and could not see any cause for problem with slide stop. Measured diameter of slide stop and compared it with other slide stops, and it was the same (.199)., will try to go to range today. I am a reloader and use the same ammo for my S&W, Colt GC & 2 Springfield 1911's with no problem. This Kimber has been a problem since day one. I had to change the slide stop retainer spring. It was too weak and caused the stop to move out and Jam the slide. I have a number of different manufactures 1911 including and old AMT hardballer and never had a problem with any of them. I have purchased 2 Kimbers my FIRST & LAST..