That's pretty cool. I wonder if the gun is actually functional. Would be extremely inaccurate without a barrel though lol. My mom's father died before I was born, but grandmother kept his brass knuckles on a shelf in her living room. I used to love to play with them as a kid. Wish I could have inherited them, but my uncle got them and I guess his son will some day.
I know my guns pretty well, the theory was punch, stab, twist, and fire the gun empty. Really the blade was the most lethal part, weak ammo no barrel. But really it was rarely used if ever, more for show and intimidation.