Where do you find the tank gun since it’s been readded to campaign

Games Halo Infinite
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1

So I know from the entrenched event update they added the tank gun back to use the problem is I don’t know where to find so does anyone know where to find so I can remember on my second attempt to use it on legendary?

2

https://forums.halowaypoint.com/t/is-the-scorpion-gun-patched/475648

3

There is a video by Genrallkidd on Youtube, I’d start there.