The MAC-10 is a compact telescopic bolt blowback operated machine pistol designed by Gordon B. Ingram and developed by the Military Armament Corporation. This revolutionary design is what made the weapon work well with full automatic fire.
In Mario Warfare, the MAC-10 is seen dual-wielded by Toad who used them to protect both Peach and the King from several Shy Guys. He did however run out ammo for these guns, resulting him acquiring the Heckler & Koch Mk. 23 Mod 0 from a nearby Shy Guy threatening to kill him.