I have an older (have not checked the serial number to get a date of manufacture) Remington 870 Wingmaster Magnum. It says Magnum on the receiver. However, the barrel says 2 3/4 or shorter shells only. I bought it off a friend who was in a bind a while back and haven't really shot it too much. I pulled it out the other day to clean it when I noticed that the barrel said 2 3/4 or shorter. Now I realize this may not be the original barrel but I've also read that older Wingmasters said 2 3/4 only. Is that the case for an older Wingmaster Magnum too?