I have owned and shot many types of guns over the years including bb guns. I don’t normally shoot people with bb guns so I’m not sure of the exact damage it would cause so I was vague, sorry for not writing an essay on the type of wounds it would cause.
Losing an eye sure but I think death is a bit far for a bb gun (I have done 0 research) but maybe a pellet gun where the projectiles are more bullet shaped maybe. It also depends on how the gun operates and how fast it sends the bbs
Edit: 4 deaths per year in the US I stand corrected