About the time we figured out that a little light oil down the barrel improved accuracy and penetration, we quit using them on one another, and very shortly graduated to actual firearms.
I have the Daisy Powerline rifled barrel model my late father used to terrorize the squirrels that would try to eat his flowers and garden. I havent fired it. My kid went straight to Dads.22 at about age 5, and hasnt thought about the BB gun.
You need to be at a range to shoot the BB gun in this part of the world, legally, so we always grab the .22s.
Had a lot of fun as a kid with the BB guns. Glad nobody got hurt.
Best,
Ted