We had a discussion long ago here about firepistons. One of the fellows worked so well it either nearly burned down the house or his dog…cannot quite remember, but it is what prompted me to order one from Jeff Wagner at Wilderness Solutions.
This is it:

It has a tinder cavity in the handle:

And a wooden ring that allowed me to add a kangaroo braid neck cord.

These are real fun fire tools. I now have 3 of them and enjoy using them. They work very well with tinder fungus and are always interesting to any onlookers. Tinder and kindling prep is all important with these as it is with traditional flint and steel techniques. A fun and useful tool but not my first choice for firemaking.