Mossberg 500® Pump Action "Mariner®", 12 ga., 3" chamber, Marinecote™ finish (more rust-resistant then stainless steel), synthetic stock. 6-shot capacity, 18 ½" cylinder bore, bead sight barrel.
See http://www.mossberg.com/pcatalog/Specpurp.htm for photo, info.
Never fired, shelf wear only.
MSRP $512, I'll sell this for $350. My loss your gain.
I'm in the Portland, OR area. Pickup preferred, or I can ship to your FFL for cost. Email replies.