That was a great find ! I'm in the process of re-building my 880, just sent away for the kit (Only $16 incld. shipping). Mine has the rifled barrel but after cleaning it for the first time ever I noticed that you have to look really hard with a bright light to see any rifling at all. Practically a smooth bore. The seals in mine were shot but I was getting 530 fps with BB;s. I'm told it will be like new with the repair kit. We'll see. Enjoy your "New" rifle.