I bought an M1 super 90 about a month ago and have fired about 1000 rounds thru it. It still does'nt cycle the second shell sometimes. This has even happened with 3" max dram #3 steel shot while duckhunting. I have shot the heaviest loads of #8 you can buy and still have the same problem, although it is intermittent---the worst kind of problem to have..... Any suggestions?