Your speaking of Lynns Dakotamart, it is a pretty cool place. There are not many stores where you can buy Guns, Ammo, Bait, whiskey, and all the groceries you could ever want under one roof. FWIW there is also a fine gun shop in Ft. Pierre called Teton River Traders, it is worth a stop. Murdo is exactly 1 hour east of me. I know that country pretty well.