I don’t know why but the on hit event doesn’t work even though It collided with the ground/wall. [78212-grenadeblueprint.png]

Is “Simulation Generates Hit Events” toggled? (This is a checkbox in the settings of any object that has collision. In your case this should be turned on for “Projectile Collision” I assume). Also keep in mind that the Explosion will disappear with the Projectile itself. Activating it and removing…