As was stated in a previous post, the new type has adjustable settings on the gas tube so I wont get in to that. As far as the ammo goes, in the short time that I have had mine I have fired the metal sleeve and plastic shells and my 410 gobbles up everything I feed it. Since mine is new, I have the setting on the gas tube to 1, even when shooting 2 3/4 or 3" shells. I was told it is a good idea to leave it like that for the first hundred or so rounds to "break it in".The next time I go to the range I will try it on the #2 setting and see how it goes. I have read where others report having prob