I was thinking more along the lines of a sten just closed bolt with no sten gun parts(make sure a sten bolt wont fit) and an ar15 FCG. few machined parts but now that I think about it zamak could be used for the trigger housings also. just have to make sure full auto parts aren't drop in but with this political climate im not so sure.
that was the idea of copying the Richardson gun something super cheap for s***'s and giggles kind of proving the fact that laws don't work but I doubt it would sell and we live is a lawyer controlled world now.
I think a single shot with a rifle and shotgun barrel being interchangeable would sell well IE jones under lever. I think a inexpensive .22lr would sell well reason I like the warner is I think it would be easy to cast and its simple having a manual extractor and a simple hammer/trigger sear making it more reliable.
like I said previously firearms wouldn't be the only thing made and I already have prototypes for other things in the works just got to get them finished and some start up cash to put this plan In motion. I'm running around like a chicken with my head cut off right not finishing everything I need to for the time being around the house and working on other things bit by bit. theirs stuff I have been thinking up for the past decade that I'm more motivated to do now and have some extra funds to play with somewhat I was looking at used machine equipment all night last night it can be had reasonably.
ps is there any reason someone could just use a mold clamped together to cast this stuff instead of injecting/vacuumed casting im sure you would end up with more junk parts due to porosity and such.
Your gun idea sounds like a right dayglo abortion. The Sten not Sten,, with the AR fire control group. You realize of course, that to actually sell something like that, first the RCMP Tech lab needs to get their fingers in to it to see how easy it is to convert to full auto, among other things, yeah?
My honest opinion is that if the AR platform had to be imported now, it would not be able to, based on their methods. Esp since you can convert it with something as simple as a coat hanger wire.
You really do need to have a SOLID handle on the Materials and Processes side of Manufacturing, so you can better choose the materials, tools, and systems, that you will need, to avoid being driven into the poorhouse the first time someone gets hurt with one of your creations.
There are a lot of things that castings are a good choice for, and a lot of ways to make castings, as well as a lot of different materials. A good place to start, is the ASME Handbooks. American Society of Mechanical Engineers, IIRC. In highly condensed form, their book on castings weighs about 10 pounds. Then you need a handle on Machining processes, and to know what they can, and esp., can not do for you. As a very tiny start... And heat treating, because a lot of metals cannot be easily machined after they are hardened, so you need to at least know why and how it works, so you understand, even if someone else is actually doing the work.
You really gotta lose the 'cheap' idea. When every corner gas station also had guns and ammo for sale, cheap guns were a pretty viable market segment for those willing to make millions of pieces and make a nickel on every one. Almost none ofthose outfits are around any more. Cooey, for example.
Aim at quality. It sells for more money, you sell fewer pieces, but at a higher margin.
. I will still look into the diecasting thing I think there may be a way to do it by outsourcing locally action would be something like the warner if I can keep the cost down. 
