how do you make a easy but powerful pen gun?
Don't use a penUse a 2X AA mag-liteGet an aluminum bar-stock and machine a hole lengthwise that matches a .22lr (the easiest to work with)Now all you do is get a small piece of steel and mount it into the head of the flash light using JB Wield in such a way that screwing down the head crimps the rim fire; setting off the round Once you get good at making these you can move onto more intricate versions using center fire roundsRemember with center fire you will have to design a way to hold the round in place and a spring type firing pin.
You can use your own voice recorder and make one up that's personalized.