My gun is fairly new ive put around 400 rounds through it with no problems. Went to the range today and after about fifty rounds i pulled the trigger and nothing happen. I locked the slide back and dropped the magazine and got the round out. It had a dent in the round but did not fire so i put it aside. Then about another 5o rounds it failde again. i got the round out and it had no dent in it whatsoever. Im new to guns and im not sure if this is common or i did something wrong. If anyone has any idea what caused this id appreciate it. I also clean my gun after every trip to the range so i dont think it was because of it being dirty.