Surprisingly, 3D printing is where most of the firearm innovation is happening now. Some use off the shelf parts from common guns like the AR-15, others are completely printed. It's a weird rabbit hole to fall into, but definitely interesting.
The "should this be legal/illegal" debate is its own rabbit hole as well.
As a diehard Netscape Navigator user, I scoff at your browser choice.
The running joke in my day was everyone used Internet Explorer... to download Netscape.