Duh..."airbags!" So that's how the BB launcher works. Here all these years I though it used a spring wound up by a squirrel in a cage. So, is that sodium azide or guanidinium nitrate, and a copper nitrate oxidizer I smell?
Oh, it's bat guana-i-din-ium.I have been known to be serious sometimes.
("Chris seems to have cottoned to our humour already." Humor...is that what it is, Ian?)