A Nevada assemblyman who was banned from the Legislature building attempted to buy a gun at Scheel's Sporting Goods Thursday night in Sparks.Assemblyman Steven Brooks allegedly tried to buy a hunting-style rifle at the sporting goods store, Sheriff Ken Furlong said."The transaction did not go through," Furlong said of the attempted purchase, adding that there is a waiting period for firearms purchases. None of the cases Brooks has been charged with have been adjudicated, Furlong said. Until the cases are adjudicated, and in the state's favor, Brook's would not be added to a do-not-buy list for that reason, although he …