Joules are defined as kg * (m/s)^2. Weight is already factored in. Shape does matter, though! A dart might be lethal if it hit a major artery or the heart. I'd

Joules are defined as kg * (m/s)^2. Weight is already factored in. Shape does matter, though! A dart might be lethal if it hit a major artery or the heart. I'd have to do a test to see if it could punch through mass equivalent to the bones of the skull. Unsure, but I'd put money that it wouldn't. This weapon looks to fire discs, not darts. No way that's going to be a lethal round at 16J.