No, not what you may be thinking, but attention getter I hope.
I was just looking for cap gun caps for possible primer rebuilding and saw these plastic caps (rather pricy) that one reviewer claims he used in his BP weapons. They are called "Pull Off Single Shot Caps".
Wondering if anyone here had tried them in the past and want to comment.
Saw it on Amazon. https://www.amazon.com/Parris-Pull-O...pb_opt?ie=UTF8
Slim