I purchased a 1300 pump action about 3 years ago. I finally got a chance to take it out a few days ago and ran into a problem. When I cycle the fired round it only grabs 50% of the time. Then I have to sit there with a spent round in the chamber and a live one that I have to remove. I cant find anything mechanicly wrong with the gun. Has anyone else had this problem and if so any suggestions on a fix.