I try to keep it interesting for him, he seems to like it, so that's cool. We just use a airsoft pistol for now. my dad has a Red Ryder for him it's a little to big for him as of now, but I try to get him to shoot it when we're at his place.
Also at that age some kids are big enough to shoot but not mature enough.
the kid's daily demeanor was like a rabid squirrel on crack and on fire, stuck in a room full of hungry cats.
I taught all of my boys at age 5. Funny thing is that the Red Ryder was too big for each of them, but the little Crickett .22 was no problem at all!