I'm trying to add in a custom weapon to Boarding Action, but I can't figure it out. It will be used on Multiplayer. I read that clicking add and weapon only adds it for single player, and that I have to use NetGame Equipment to add in a weapon, but you have to replace a weapon. That is kind of stupid, is there another way?

What? Replace a weapon? What are you talking about?

In guerilla, click file->new tag then find "Item collection"

in the new item_collection tag change the weight to 100 and then click the button with 3 dots (...)

find the .weapon tag of your custom weapon and click open

now save the item_collection tag and then you can use that to place the weapon in the map. No weapon needs to be replaced.