My eighteen-year old nephew, who is staying with us for a while, has no idea how a firearm works. Any kind. I tried to remedy his (lack of) education. I started with a diagram of a matchlock, proceeded to a flintlock and explained the composition of a cartridge and the function of the hammer and firing pin. We left the lesson at the feeding mechanism of the Spencer rifle. Truly, he needs some hands-on training, not theory. He's a smart kid. I'm sure he'll catch on quickly.