I just bought a Glock 19 and went to the range today. Now I have a few questions. I had 5 FTF out of 200 rounds. Ammo? I was shooting 115 gr. (white box). Next I had a few failures of the slide not staying open after the last round. Ammo again? Then as I was cleaning the gun I noticed the copper marks on the ramp were only on the left side of the ramp. shouldn't they be right in the middle?