Sort of the ultimate bazooka
Ah, not quite. A “bazooka” is a rocket launcher and a smooth bore. It fires a spin stabilized rocket, usually anti-tank (HEAT), but also HE, TP, and WP Smoke.
The Carl Gustav is an 84mm recoilless rifle with a rifled barrel. The round has a pre-engraved rotating band and the rifling spins the round — just the the projectile from a rifled firearm. The Carl Gustav fires HE, HEAT, APERS, WP Smoke, and TP rounds. Recoilless rifles have greater range and accuracy than the smooth bore bazooka.