Was really surprised not to see mention of the Mossberg Super 1000. Very nice gun made by Howa for Mossberg off the S&W 1000 patent. Very nice gun, great wood, if not a bit heavy though.
The date is wrong for the 590 Mariner. According to Havlin it was introduced in 1987. My serial number dates mine to 1989. I don't think I'd trust Gun-data.com for this.
The fold down fore grip or monopod grip carbine models are the 142-A bolt action and 152 semi-auto. There are later models also I think ...the 342 and 352 ?