My new Ranch/223 will not eject a fired shell. The bolt captures the shell base when it moves into battery, but after the trigger is pulled the bolt retracts and the shell remains held by the three gripping sections on the bolt's face. I have to remove the shell manually and then let the bolt close normally. A major pain! I've looked at diagrams of the rifle, but cannot visualize what the problem is. Can someone explain exactly what is supposed to happen to successfully eject a shell?