Have a 3 week old Gen 4 Glock 17 with a born on date of 04/11/11, Serial # PPRXXX. I've put the first 600 round through the gun and had 10 Failures to Extract (FTEs). I also get a fair amount of brass to the face, in addition to forward ejections and ejections straight up at 12 o'clock. I tried swapping out the stock recoil spring from the "2 1 0" stock spring to a LWD SS guide rod and 13 lb. ISMI recoil spring after 400 rounds and had 6 of the 10 FTEs with this setup, so I put the stock sprin