I doubt they can print a "spring" and have it a spring, it would at minimum need to be heat treated. Just looking at the pictures, this would look to be aluminum, not very much better than his plastic prints. This guy makes a lot of noise, people need to ignore him, his stuff is useless, the technology he used for this piece is way to high priced to be practical. It is much cheaper to manufacture even a single gun the old fashioned way than this way.