How do weapon manufacturers start? -

Like for example; Boeing, Colt, or Bushmaster.

You can read up on your example companies histories (in Wikipedia or elsewhere) to get the details.Otherwise, weapons manufacturing is just a business. So, start it like you would any other.Example: ask the authorities about basic requirements, find financing, get a license from a foreign manufacturer (say, whoever makes Kalashnikovs), fill up all the documents with your state, find land, build a small factory, hire people, manufacture the weapons, sell them to local distributors and you are on!A certain amount of bribing (or lobbying, as the kids call it these days) may do wonders with the afor-mentioned authorities, but don t tell them I advised you on that ;-)