A new, community-hosted Unreal Engine Wiki - Announcements and Releases - Unreal Engine Forums < That is what you need.
I’m no coder by trade, but as I recall anyway, objects in a game need a class, for everything, so a class for ‘weapons’ and you reference that class with functions.
THe url will answer other questions no doubt, it should suffice, and you can go from there with functions you want that may not be listed.
As noted of course in the instructions, you still need a UI to display such items in game, assuming that’s your intent.
Cheers
nl