People invent things and among them why not a Bazooka, some are more versatile than others, some more or less powerful. But everyone does it with a playful intention.
A good examples:
Este es "Made in Spain" BAZOOKA AIRSOFT RIJUIN 0,43 / MOD. BR-043.Esta es su web:www.rijuin043.es.tl
Here you have a bazooka manufactured by Apple Airsoft HERE