When used, the Gunner fires a concussive blast, then propel themselves with the arm cannon while punching into the air. The concussive blast can meteor smash opponents, similarly to Palutena's Rocket Jump. The move can hit twice (the blast and the Mii's fist) and is fairly strong, but as a recovery, it does not cover much distance.
In Ultimate the move is now revised to be Cannon Jump Kick. The move is functionally identical to Cannon Uppercut, but it uses a kick instead of an uppercut to deal damage.
Special Move customization was added in Super Smash Bros. 4. These are the variations: