I bought a fire piston to try it out. It does create an ember however I have been unsuccessful in creating a true fire.
I am intrigued with the idea. It does work. I just have to figure how to go from the ember to tinder to fire.
The problem I have it that when I add it to tinerd, paper, cotton balls with petroleum jelly or alcohol, there is just not enough heat to combust.
I will keep on trying. If you have any ideas, let me know.