According to this story,
Magpul's departure could crack plastics industry, manufacturer says - Boulder Daily Camera, their departure could have a larger economic impact than some fear.
The article states that Magpul spent $46 million last year, in supplies from various CO companies. The company estimates that they wil spend $85 million for supplies in the coming year. Alfred Manufacturing, in injection mold company, says that if Magpul leaves, they will follow.
If we are to believe the figures the article states, Magpul will directly affect 200 jobs and Alfred will affect 150 jobs. Indirect labor losses are speculative at this point. Regardless, that's a lot of well paying jobs and a loss of a major source of revenue to the Denver metro area.