Rubber bullets can cause internal bleeding or organ damage, even if the bullet doesn't break your skin. They can injure organs like your heart, lungs, spleen, kidneys, and liver.
How painful is a rubber bullet?
A rubber bullet can break skin or cause serious welts or bruising. If you get hit by one from 30 yards away, it feels like a strong punch. If you get hit in the neck, you could sustain permanent damage or life-threatening injury to your airway. If you get hit in the eye, you could lose it.
Can rubber bullets knock you out?
Rubber bullets won't generally knock you out. They are great for crowd dispersal and corralling people though.