Buy your boy a doll if you want him to turn into a sissy.
I always liked the toy hand grenades you could put more than the approved number of caps from your capgun into. Made a nice noise when it went off. Even better than piling up the caps and hitting them with a hammer.
Just remember - if there isn’t a risk of injury, it’s probably not a good teaching toy for a boy.
Daisy Red Riders are cheap, and a good way to start teaching gun safety and targeting.
I hit an WHOLE roll of caps with a big sledge hammer when I was 8. On the garage concrete floor. I think that was the day my tinnitus started. Ears are still ringing.