Have you set the owner of the gun? and you also need an instigator on the projectile spawn
The gun also needs to replicate in my experience. Also needs an owner and instigator or the server doesn’t know who stuff belongs to. You can set owner on pickup or on spawn.
Replication is a *****, miss one checkmark and stuff stops working. Variables are the fun ones because you need to figure out what needs replication and what doesn’t