1000.00 RARE Stevens 311R (Riot) Factory 20 Gauge Coach Gun Oshawa / Durham Region May 26, 2024 - 8:46 AM 3screwsloose NO TRADES. Rare factory made Stevens 311R Series J 20 gauge 2 3/4 and 3 inch chambered coach gun with 18 3/16 inch barrels. Awesome shape from a collectors estate. Shows very little use if any.