First thing I would do is find someone who really understands firearms and have
them sign a non-disclosure document and show them drawings of your idea and
explain it. See if they think it will work and if there is a demand for it. It
is real easy to delude yourself into thinking that you have an idea that is
worth millions. There are lots of people out there making millions off
inventors with an idea. Not as many inventors are making money off their ideas
though.
DL