How do you get the recipe for projectile ammunition?

I was playing multiplayer the other day, and a friend of mine was able to craft Projectile Ammunition using Ferrite. I don't have that recipe, and he doesn't remember where he got it from, but he did confirm that there is a blueprint for it.

Googling didn't turn up any information at all about a recipe, I only found links that talked about the different weapon types.

Does anybody know where/how to get the recipe?

I do not think there is a blueprint for these. I just checked in my game, and when I went into the crafting menu in my inventory, there was no option to make more ammo. However, when I hovered over the ammo that I already had, and pressed E to craft more, it made more without any issues. Interestingly enough, the ammo shows up in the crafting menu now. This might be a bug.

One thing you can try then is have your friend transfer some ammo to you or find your own (I believe I first found my own ammo via searching containers that are randomly found on planets). Once you obtain some, see if you can craft some via the method I just described above (hold E on it - or whatever the console equivalent would be). If it does what it did for me, you should then be able to craft your own ammo in the crafting menu after that.