I have a G19C I have been shooting for 1000s of rounds successfully (so its not my grip or limp wristing), recently I shot a few thousand rounds of Wolf Military Classic through it, and other than being a light load it worked just fine. Well this past weekend I ran out and moved on to my Blazer Brass, and the G19C would stovepipe 1-2 times per mag. This is really disturbing....so I really want to get to the bottom of this. I took the gun to a private range and did some testing, I swapped the extractor and the extractor spring out and the problem persisted, I put the original extractor and spring into my G26 and it worked just fine, so that is not it. I looked at the ejector and it looks ok, so I was stumped. I took the gun to a buddy who knows his Glocks really well, and we compared the ejector to a new one and could not see any wear or issues. However he did notice something odd on my trigger bar, the bar of the bar that depresses the firing pin safety has a rough rear edge. On closer inspection, it does look like the rear edge is worn, almost beveled, and even more interesting the wear does not go all the way to the top, there is a lip of the trigger bar that is not worn right at the top. Looking at a round ejecting it looks like the round rides along this part of the trigger bar and when the end of the round clears the trigger bar it is ejected out. The working theory now is the Wolf has worn the trigger bar left this little lip, and when the hotter Blazer Brass is fired the casing is catching on the lip and tossing the brass back into the chamber. Something that is enforcing this idea is about half the stovepipes, the brass had done a full 180 and dropped into the chamber again. This would make sense, the lip is catching the front of the brass, and flipping it 180.... Below is the best picture I could get of the lip. Later this week I will get a change to try a different trigger bar to isolate this as a source. I am going to put the suspect trigger bar into my G19 and see if the problem follows the trigger bar....I will keep you posted.