My pellet gun will take down small animals, as in kill them. Any child should have adult supervision if there are lead pellets in the gun. BBs are not as lethal as the pellets and there are some pellets that are more destructive than others. I have the most destructive in my gun.
The size and design are an exact replica of the real gun, so yes, color them so people don't get killed by having one in their hand.
The next thing, gangbangers will start painting their guns...
They should make these in colors instead of black so cops would know they are not real handguns.