From Red Faction Wiki
  • The Grinder is a weapon in Red Faction: Guerrilla.


    The Grinder fires razor disks at high velocity. The motor needs to charge briefly before it'll shoot, so take that into account. The disks are deadly against EDF soldiers, but won't cause much damage to structures or objects. „
    — Guerrilla Handbook

    The Grinder can be purchased from the upgrades table after completing 12 Guerrilla Actions. Its functionality can be improved with upgrades to lower its charge time, switch to explosive discs, and increase ammo capacity.