Hi, I just recently purchased a Glock 21SF and a 30SF. I shot approximately 150 rounds out of each gun and for every second or third round, the casing ejects straight back either hitting me in the forehead or the glasses. Does anyone else have this problem. I have a Glock 21 and 30 and have noticed that the extractors in the 21SF and the 30SF are at a different angle and actually dent the casing when a round is chambered. If I put an old extractor in the 21SF and 30SF, does anyone know if this will solve the straight back ejection problem. Any advice would be greatly apprectiated. Thanks.