FILE - In this Feb. 28, 2013 file photo, workers assemble 30-round capacity ammunition magazines for high-velocity rifles, inside the Magpul Industries plant in Erie, Colo. Magpul, one of the country's largest producers of ammunition magazines and other accessories, left Colorado in protest of the state's 2013 gun laws that limited the size of magazines to 15 rounds. (AP Photo/Brennan Linsley, File)