Star Kronos Metal Stefan Kit

The Star Kronos Metal Stefan Kit converts a Nerf Rival Kronos — a blaster built around round Rival balls — into a Stefan-dart shooter, which is exactly the kind of conversion the springer modding scene has been chasing on this platform. The kit swaps in a metal breech replacement and a new inner barrel sized for Stefan darts, plus a set of spare o-rings so you've got backups on hand once the originals wear in.

This is a serious conversion, not a bolt-on accessory: fitting the kit requires irreversible modification to the Kronos shell, so there's no going back to stock once you've cut it in. It's also built specifically around Worker Talon Mags for feeding, so plan your magazine purchase alongside the kit rather than assuming your existing Rival mags will work. If you're committed to turning a Kronos into a dedicated Stefan blaster and you're comfortable with permanent shell work, this is the kit that gets you there.