Economies aren't fixed like this. You can say jobs are lost, but other jobs will take their place. We buy guns - if we don't buy AR's then we buy something else. Those that make something else see increased demand and employ more people.
Those people who made fax machines and VCR's are not sitting at home waiting for the market for those items to return....
If they don't produce ARs folks buy what? Toasters? What product substitutes for an EBG, but another EBG? But they'll all be banned. It's not like Chevy gets closed by the .gov so you buy a Ford.
And if the production of EBGs is banned, how long until revolvers and lever-action rifles are banned too? (Answer: not long)
Airsoft anyone?