Catapult

[Hrusai]

personally i think that a slingshot is a brilliant alternative to rifles and bows etc.
they are compact, powerful, no fussy with ammunition...any rock will do after all, are easy to repair and such like, are easy to make, any stretchy material will do, and they are very accurate with enough practise, honestly i cannot see any downside to including one in your GHB or BOB...personally im planning on buying a few, small size, powerful, accurate and all sorts of other advantages!