Join Carol McGowan Sunday May 26th from 11am-1pm @ The Grand Opening of the Gander Mountain Superstore at 1630 Southlake Mall in Merrillville, Indiana. NOT JUST ANOTHER GANDER MOUNTAIN STORE! The Gander Mountain Firearms Supercenter has the largest selection of guns and hunting equipment from the top manufacturers in the industry. The best of the best; plus we've added more firearms specialists to give you the one-on-one service you expect. The biggest selection, the best brands, and more full-service attention – it’s all waiting for you at the new Gander Mountain Firearms Supercenter!