North Denver’s Alfred Manufacturing Co. has grown from 40 employees in 2008 to 150 largely because of the work provided by Magpul, said the company’s third-generation chief executive, Greg Alfred.

Magpul, which used to be based in Erie, pulled out of Colorado last year in protest of a gun-control bill that Gov. John Hickenlooper signed into law in 2013 prohibiting the sale of gun magazines ...

Magpul’s polymer magazines have been popular with service members throughout the years. But before the Corps approved the use of the polymer magazine, there was a temporary ban in 2012.