Which gun mod was used in Minecraft Clash?

I started with Minecraft Freedom now that I have time. When Paluten went to Minecraft Clash and then attacked the office building with Izzy and Sturmwaffel, I was interested in this Gun Mod, unfortunately I don't know the name. Can you tell me him

This Youtube video explains which mod you have to use. I also searched the website: https://www.feed-the-beast.com/modpack.