The Cosmo Buster (コスモバスター Kosumo Basutā) is the standard-issue firearm of the Cosmomen.
The Cosmo Buster (serial code CMG-4-001) is a ranged weapon that is powered by solar power and Star Power.
It has two modes: the "Power Shot" (パワーショット Pawā Shotto) mode, which has stronger firepower but lesser range, and the "Long Shot" () mode, which has more range but lesser fire power.
To switch between either of these modes, the user pulls the outer grip (inwards for Power Shot Mode, outwards for Long Shot Mode); the Buster will announce the mode in use (e.g. "Power shot mode!).
On its side, there is a place where the user can scan a Cosmo Card for powered attacks.