1956 ACMA Vespa 150 T.A.P.
The 150 TAP's mounted M20 75 mm recoilless rifle, a U.S.-made light anti-armour cannon, was very light in comparison to a standard 75 mm cannon but was still able to penetrate 100 mm of armour by HEAT warhead. The recoil is counteracted by venting propellant gases out the rear of the weapon which eliminated the need for a mechanical recoil system or heavy mounts, enabling the weapon to be fired from the Vespa frame.
The scooters would be parachute-dropped in pairs, accompanied by a two-man team. The gun was carried on one scooter, while the ammunition was loaded on the other. Due to the lack of any kind of aiming devices the recoilless rifle was never designed to be fired from the scooter; the gun was mounted on a tripod, which was also carried by the scooter, before being fired.
The "Bazooka Vespa" was relatively cheap: Vespas cost roughly US$500 at the time, and the M20s were plentiful. Five hundred Vespa TAP scooters were produced.