How to sync a variable Transform via photon?

So , I have a variable, called rifle which is a transform

there is a script saying if rifle = null{ stay unarmed} (of course this is just a rough explanation of the script)

now I want to sync the transform variable across the network via photon, to sync whether its null or not, and which transform is it that is assigned .

I have no idea how to sync this? Any help?