I have a friend who was given a winchester 1300 that shoots 2 3/4 and 3 in shells it cycles fine when I load the gun and unload it but when firing a shell the chamber locks and will not allow you to pump and load 2 and or 3 round without pushing the small button to load the first she'll so as of right now you have to shoot press small button pump shoot and repeat the gun had not been fired in several years it was broken down and cleaned we tried 3 in and 2 3/4 shells any suggestions?