Are their "kits" already heat treated?

They're ready to go generally. They sometimes offer unfinished blades too, but those will be specifically marked as such and not be in the kits area. They're a good company, easy to do business with. I buy a lot of misc stuff from them and have actually been using a Stinger kit with a few tweaks as my edc for a while now. It's no Benchmade, but it's not bad.