300.00 Mossberg 200K-A Pump Action 12 Gauge Oshawa / Durham Region May 27, 2024 - 8:35 AM 3screwsloose NO TRADES. Uncommon Mossberg 200K-A pump action magazine fed 12 gauge. 2 3/4 inch chamber. Barrel is 28 inches long with an adjustable choke on the end. Bore is excellent and it shoots A1.