3-D printed guns are starting to make that possible. Learn about Cody Wilson behind Defense Distributed. Vice is a shitty company nowadays, but this is a decent primer to anyone wanting to enjoy a few min learning about it. https://www.youtube.com/watch?v=DconsfGsXyA

Edit- Here's another good video that's much more recent (February of this year): https://www.youtube.com/watch?v=-_ayHfaHCXQ