I took my brand new out of the box G34 to the range today. It failed to fire the first shot. Had 2 more FTF with the first 17 round magazine. Another 2 FTF with the 2nd magazine. A total of 5 FTF with the first 50 rounds. The slide did not stay open when the mags were emptied. I reloaded with new ammo (Speer Lawman), Shot another 50 rounds and it was flawless. Im new to Glocking but this seemed a bit unusual to me. Should I be concerned? Anything I can check on the gun? Could it have just been bad ammo? Appreciate any input. PS- When it fired it was ON! Didnt have to be embarrased when pulling the target in like with my G27!