After getting 4 replacement guns (2 GEN3 G19's and two GEN4 G19's) and each one either out of the box, 500 rounds, 800 rounds, 2000 rounds they all at some point start throwing brass back at my face. Saturday at 800 rounds my newest GEN4 G19 threw three casings back at me in 50 rounds. The last one hit my shooting glasses so hard it chipped them. I can imagine what it would have done to a bare eye! The guy shooting with me is on his second replacemnt GEN4 G19. His started beating his head at 1000 rounds. The first right out of the box. We also watched a girl with a new G17 freash out of the box dodging brass to the head. No matter what anyone says this is a large scale problem. Before anyone says anything I was shooting Speer Lawman 115gr. FMJ and Federal HST 124gr. +P ammo. No weak ammo. Glock has tried to make it right to their credit. But th guns just haven't worked for me and several othrs at the range. I will look for an older GEN3 or even a GEN2 G19 since I have a ton of magazines and parts for the G19. Maybe Glock will get it worked out. The last gun was better than the first. They are improving. But they are not their as far as "Perfection" yet. I traded the gun for a S&W M&P 9c at the gunshow locally this weekend. Fired 220 rounds through it without incident yesterday. I'll keep my older Glocks. They work 100%. Maybe at GEN 4.5 or GEN5 they will have it right. I'm done. Too much time, money, and effort to get them working only to have the same thing come back at some point. If a spent casing can chip your safety glasses it will sure as hell tear your eye up. Go luck to all those trying to work through the problems. And if you've got a good GEN4 there's a lot to like. It didn't work out for me. I tried!