you used to get them plastic rockets youd put caps in the end and throw em for similar effect.
i got hit by a car when i was about 7 running away from someone who threw one at me
we used to buy tons of caps, used to be fun getting the whole reel and going down them fast with a coin, doing the lot.
some were better than others, used to scratch em with your nail to check that, some were fine, some would take half your fucking finger off
not seen them bangers for years, tho obv never looked, but saw some kids with em near work the other week, but thats somerset, so they all inbred and 20years out of date anyhow