Battle mode force building question

Someone please link if this has already been asked.

In the Battle Mode packet, it says you can take one mod per weapon, but it does not say to include their cost. I am looking for clarification because right below that it says you can as few or as many perks as you can afford. Thanks in advance for whomever is able to clarify

What is meant is that you cannot have more than 1 mod on a weapon, you still have to pay the cost unless it is listed as coming with the unit

I assumed as that is only fair and makes for more balanced. I figured I would ask because it is the only thing I have seen that does not say something about costs.
Thanks for the confirmation.