Mario fires his 3-shot Plasma Rifle.

The "Covenant Plasma Rifle"  is another one of the Halo weaponry featured in Mushroom Kingdom Fusion. Currently, its first appearence is in World 9-4, Covenant Assault.

The Covenant Plasma Rifle is an upgrade of the Covenant Plasma Pistol. Unlike the Covenant Plasma Pistol, the Covenant Plasma Rifle is an automatic weapon. The Covenant Plasma Rifle carries the same amount of ammo as the Covenant Plasma Pistol. They each have 60 shots worth of ammo, but the difference between the two is that the Covenant Plasma Rifle fires a three-way shot, which consumes 3 shots of ammo instead of firing 1 shot of ammo; which the Covenant Plasma Pistol does.