H/T to Donna!
I loved those old roll caps. And Greenie Stick-M-Caps, too.
I still have a box of 'em! :o)
You could use those cap in the little metal rocket ships - remember them, Gorges? :o)
We used to hit a whole roll with a hammer... My ears STILL ring!
That was fun, too! Those sparks did fly! :o)
Wish I still had my cap guns..... :o)