I have an old beat up 22 single shot for the kids to shoot. The stock has been hack sawed off to fit little kids. If you try to have them shoot with a full length stock, they can't get down on it right to see the sights.
I also have a green gas Glock air soft pistol and a cardboard box for a bullet trap. If one of the kids want to shoot it, I stop whatever I am doing, get the glasses and take them out on the back porch to shoot.