The proposed ban on the sale, transfer and manufacturing of many high-powered, semi-automatic guns in Colorado will face an uphill fight in the state Senate after clearing the House for the first time. The measure, House Bill 1292, would ban guns referred to as “assault” weapons by its Democratic sponsors. It now heads to a Senate committee that includes one of the most vocal gun violence prevention advocates in the state — who happens to be a longtime skeptic of the effectiveness of blanket prohibitions like the one proposed. Sen.