Hey guys, I have a Gen 4 Glock 23 made in january 09. I kept the original spring for it, and also have the new one they replaced them with recently. I've tried it with both with the same results: Every 100 rounds, at least 2 or 3 rounds fails to feed. It is always the last round in the magazine with the mags i've been using. The round appears to be pointing up in the chamber. I used the same magazines with my Gen 2 23 and it functioned flawlessly. Help!!