BB’s seem to make perfect secondary firing pins.
True, but tape makes a lousy firing chamber and barrel.
Yes....but thin brass casings seem to make lousy firing chambers.
“BB’s seem to make perfect secondary firing pins.”
As a dumb kid I found a shotgun shell and wedged it into the crook of a tree. Then got back about 15 feet and stood behind a second tree. Aimed carefully with my Daisy BB gun trying to set the thing off.
First shot I nailed the thing. Didn’t set it off, but the BB ricochet right back at me and hit me. I don’t recall where - but glad it wasn’t in my eye! (I don’t think as a ten-year old back in the day my folks or I had even heard of safety glasses!)
Never tried that again. Other dumb stuff - sure. But not that!