{RESOLVED} How do I make upgrades for weapons? and how does it just replace the weapon with the new one?

How do I make upgrades for weapons? and how does it just replace the weapon with the new one? I am very confused. Can anyone help me with this?

Welcome to the community @Xantor! Maybe try these guides? And if you have any questions about them, just let me know.

Oh. Alright, I never knew the tutorial had to help with it.

make sure to mark a solution!