My 17 is now jamming somewhat reliably once or twice per range session (usually 100-200 rounds per session). Attached is a picture of what it looks like when it jams (reproduced as well as I could at home). Basically, it mostly extracts the fired round, but doesn't eject it. It begins to feed the next round from the magazine which then jams against the empty. To clear, I have to lock the slide back and pull the magazine out. Today, after it did it twice in a few minutes, I disassembled the slide and swapped extractors, spring loaded bearings, and plungers with my 34. I then put another few magazines through each gun using the mag that the second failure happened with (I didn't think to keep track of mags until the second one today). Unfortunately, there were no more failures after the parts swap...and I ended up using up all the 9mm I'd brought to the range. I think my 17's extractor does have a small chip at the bottom corner (basically, that corner's been rounded off). But when it was in Smyrna for the frame recall/upgrade, I mentioned this in the letter I sent with it and they said the extractor did not need replacement. I kind of would like to upgrade all my 9's to the newer LCI extractor, and I wonder if doing so will fix my problem. It looks like doing so would cost about $20 per gun, unless Glock is giving the parts away. BTW...I don't believe this is a limp wristing issue. Last weekend after it jammed, I tried to make it happen again by intentionally limp wristing (holding the gun as loosely as possible without dropping it, firing one handed really loosely both right and left handed) and I just couldn't get it to happen.