Ive been hearing mixed results. Some glocks born this year are having problems, others are not. I know a lot of people with Gen 4 19s with P Q R or S starting serial numbers had major issues. My own experience is as follows:
I had a transitional Gen 3 19 that would kick brass straight up in the air about 1 inch, and drop right back down into the chamber as the slide was closing causing an annoying stovepipe. (336 ejector). when it worked properly, the brass "dribbled" out of the ejection port and ran down my strong hand. It was entertaining in a gallow's humor way to watch the gun kick brass to the 7, 8 and 9 o'clock position sometimes too. I don't care what the BTF deniers say, you cannot have a gun kick brass to the opposite direction of the ejection port and blame how you hold the weapon. (and when i'd pick up any other pistol, the problem magically dissipated!). I had read about all the problems plaguing the gen 4s and figured they were tailored only to the gen 4s (WRONG), so I bought a gen 3. Boy i was irritated when I found out I had become a victim.
I guess there are two ways to correct it if you really want it to work (you could just sell it!).
1. Call Glock and have them send you a prepaid shipping label, tell them what the gun is doing, demand they test fire 100 rounds through it and ensure the weapon is functioning properly. if you get it back and it's still screwed up, rise and repeat. This is probably the way I should have handled it. It was their screw up, let them pay for it. But I can't help myself I need to tinker. Plus I figured this would be a good learning experience even if working on this pistol turned into dissecting a gun-cadaver for educational purposes.
2. Fix it yourself. Even if you're not a gunsmith by any stretch of the imagination (im not), glocks are so damn easy to work on you don't have to be. To fix the brass to face issue you literally need two tools. A 3/32nd punch and a pair of pliers (if you have a gen 3 gun). You will need to purchase a couple items, I will list them below with links
(a) A new Extractor and Extractor Spring from Apex link:
https://apextactical.com/store/product-list.php?pg1-cid22.html
(b) A NON-Loaded Chamber Indicator Spring Loaded Bearing (Non-LCI SLB) link:
http://www.midwayusa.com/product/114074/glock-spring-loaded-bearing-glock-17-19-26-34-without-loaded-chamber-indicator-black also another link:
https://www.lonewolfdist.com/Detail.aspx?PROD=382&CAT=137
Here's a pic of what the difference is:
http://i811.photobucket.com/albums/zz31/EdgecrusherXES/Glock%20Info/LCICompJPG.jpg
http://i811.photobucket.com/albums/zz31/EdgecrusherXES/Glock%20Info/LCICompJPG.jpg
(c) The 30274 Ejector if you don't already have one ( the part when you buy it usually comes with a gen 4 housing, if you have a Gen 3 gun like I did you need a pair of pliers to pull the old ejector out of the gen 3 housing, and push the 30274 ejector into the gen 3 housing... basically throw the gen 4 plastic housing away..) linky:
http://www.midwayusa.com/product/225860/glock-trigger-housing-with-ejector-glock-9mm-generation-4
Here's a pic of the 336 (top) vs the 30274 (bottom)
https://1.bp.blogspot.com/-zks7_Joc6W4/UI1EnOqm73I/AAAAAAAABWA/_30dII1NPQg/s1600/Ejectors-side.jpg
https://1.bp.blogspot.com/-zks7_Joc6W4/UI1EnOqm73I/AAAAAAAABWA/_30dII1NPQg/s1600/Ejectors-side.jpg
(d)? You can try running a 15 pound recoil spring if you want really strong ejection... I didn't find it necessary. a reduced power recoil spring will speed up slide velocity, but will probably increase wear on the gun.
If you need help detail stripping your glock to replace the parts, search on youtube something like, "detail strip glock", or "glock complete disassembly" . Look for videos that have 720 or 1080p resolution available. Watch the video first before you tinker. Then watch it again, pause it, work, unpause, etc and you should have no problem. If you get stuck, watch another video with a different angle or different explanation. That's how I learned. There are copious amounts of videos on this topic and on the general topic of detail stripping glocks
I hope this helps anyone with the problem, and I hope it makes people not fear buying a 19... they are really good pistols, fun and cheap to shoot and the brass problem is pretty easy to fix. whether or not you should spend more money fixing a new gun that was messed up from the factory is another topic entirely...
I'll leave you with this, if you're really interested in getting more into what's going on with brass to the face... it's Randy Lee's dissertation on the problem. Link below:
http://www.m4carbine.net/showthread.php?92447-Randy-s-dissertation-on-erratic-ejection-and-extraction-in-the-Gen-4-Glock-9mm-pistol
Also, read what poster "English" had to say on this very topic, he is post number 8:
http://www.glocktalk.com/forums/showthread.php?p=21099942