I consider anything that fires Metal to be a real gun. Pellet guns, BB guns that shoot metal BB's, slingshots with lead or other lethal projectile.i don't know why people think that pellet guns (or any air gun, talking about BB and airsoft are toys) here in Canada that pellet gun is classified as a fire arm (if it shots over 500 fps its a real gun in the eyes of law here)
sorry for your loss.
Airsoft with plastic or ceramic are toys, toys for adults, but toys none the less.
If you can have a fun day of stalking your friends and shooting each other in the face with it and no one has to have medical care, then it's a toy, if someone has to dig projectiles out of their skin, then it's a gun.