This is actually a Lego missile

https://brickset.com/parts/design-15303

https://brickset.com/parts/design-29340

https://www.bricklink.com/v2/catalog...or=18#T=C&C=14

used by a launcher such as this one:

https://www.bricklink.com/v2/catalog...P=15301c01#T=C