WOW very cool!!!!!
I have just gotten some parts made from e machine shop. You download a program that helps you design your parts and gives you an instant quote. The design program is kind of limited but it is free, free is always good!!. You can also import dfx files from another cad program into the emachine program. I got some semi auto mg 42 conversion parts laser cut and was pretty pleased with the results. The delivery time is kind of long, took about 25 days but the price was right.
This opens up a whole new dimention for the home hobbyist gunsmith. You can get all types of complex stuff made from your own design. It is worth checking out, I have several new build projects that I will be doing and will now be able to do some really advanced builds.