I'm sure that this problem has been discussed before but I have looked around and tried to search but that function is down. I took my gun to the range and was shooting NATO ammo from ammoman and WWB from Wal-mart. In the last two trips I shot about 200 rounds of each through my G-19. The NATO ammo worked flawlessly but I experienced two FTEs with the WWB. The spent casing was left in the chamber and the slide would cycle and jam open as the next round was pushed forward. The extractor appears to be in good shape and it left marks on the casing where it tried to extract. Is there a good solution to this problem? Am I being paranoid since it only happened twice in 400 rounds? Thanks!