mcb,
The chap that said that was relaying what a local gun store owner had told him. That they were having to send almost all of them back to have extractors fixed. I am afraid I don't remeber which board I saw that on. It may only be a rumour started by jealous Marlin fans ;^)
PS. I saw somthing neat along these lines at a gun show a while back. It was a custom Winchester 94 takedown model with a 45 Colt 16" barrel and a second barrel in .410 Unlock, pull, twist and reverse to install the other barrel. Pretty slick.