OK, I have an older 870 Express. I have been under the assumption that it was a standard receiver and only 2-3/4" shells should be used in it. I have it listed for sale in the market place and it was questioned if it were a magnum receiver that is ok to use 3" shells with. There is an "M" at the end of the serial number, but I don't know if that is what was used to designate it as a magnum or not. I was under the impression the magnum receivers had the entire word "Magnum" stamped into it. Here's a couple of pics, what do you think?



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