Locus

Can you explain what exactly you want to achieve? So I can test with the case. Or you can share sample project I can reproduce the issue.

It doesn't matter your base class is BP or not. you can set whatever you want in the LocusReplicationGraph inherited blueprint.  But your project should not be BP only...

No you don't need to care about scenes. It's bound to NetDriver so the setting will be valid across network scenes. Yes, just add your classes there.

It depends, But I strongly recommend you to tweak those settings as low as possible, and expend further later on when needed.

Thank you for sharing these errors, can you share me callstacks? so I can look into it. Have you added more than 200ish items in a grid?

You have to list up all networked actors in Replication Info Settings. At least it's root AActor class.

You have to add your gun BP to the setting list Only pawn is listed in default settings

Exactly, because there's already a setting for Pawn which is parent class of Character. You don't have to. Likewise, if there's a parent class that represent all of you item...

Default RepPolicy for all networked actors is 'Spatialized Dynamic'. If you want 'Always relevant' or 'Spatialized static' or 'Not routed'(like your Gun), you need add your own policy for that...

Exactly, you're putting too many Items in small range. That error is came from pure ReplicationGraph plugin, not from mine. How's put your non-player actor to Spatialized static policy? If...