Looking for some suggestions to fix a broken colt. Just bought this gun used a couple of days ago. I have 3 clips for it and they all do the same thing. If I load more than 4 rounds in any of the mags the slide will not close. The slide pushes the bullet down and the round hangs up on the bottom of the barrel. If I load three rounds or less in any of the mags, the guns feeds correctly.Any suggestions would be appreciated.