Nah, the army would win. We have a bunch of individuals with firearms that practice using them on the range or maybe hunting. That's a far cry from opposing an actual military. Sure the tech outpaces the army's but most people are just going to hide in their houses. The rest will be seen coming and when martial law is enacted and they go house to house seizing guns, it'll be over. It's not like they can't learn how to use modern weaponry. Most people vastly underestimate discipline and organization.

This assumes there is no modern military for this premise.