I just bought a new Remington 11-87 Police. It has the 7 round extended magazine tube and rifle sights. I don't know much about this model and was wondering how it compares to the 1100. The owners book makes distinctions between interchanging parts with an 1100. I already have an 870 and a Benelli M1S90. I like the 11-87 because it has an 18" barrel and is semi auto. Who can tell me more about this 11-87? Thanks