I recently picked up a KKM 10mm conversion barrel for my Glock 21sf. I added a 22# spring and steel guide rod. The other day I went out to the range with some reloads I made up with some new Top Brass cases. I use a 180 gr zero bullet with 8.2 gr of Power Pistol. The first 20 or so rounds seemed to be ok. Then I started having FTF malfunctions. It was closing time for the range so I just packed up and went home. Then next day when I looked at my spent brass i saw the damaged cases you see below. Looks like they are getting mangled by the slide as they eject which probably caused the malfunction. Any ideas what is causing this and how to fix. I've read that it could be the length of the ejector. Do I need to get a G20 sf ejector to make this work? KKM said it should work with just the extractor mod. Thanks for any advice you can give. CG Wanna kill these ads? We can help!