children the difference between toy guns and real weapons. My father did it successfully with him, my father's done it successfully with me, and so far I've done it successfully with my four children. We have nerf gun wars in the house that rival the War in Heaven, but every single one of my kids knows proper handling and use of real weapons, and the rules and protocols if they encounter a real one out there in the world.
Not trying to be "negative" here, but if I were your kid, I'd be insulted that you don't think I'm capable of comprehending the difference.