Ah, yes, that glitch. Funny that it can be actually fixed, i recall that the slug would go through any number of walls, or close enough anyway.
Speaking of Gauss slugs, i miss the Promethean shield from Halo 4 because it could deflect Gauss shots. I found out that by accident once: Saw a Gauss Hog coming, activated the shield because i was in the open and i was very surprised when the slug got deflected. (Then the Hog probably splattered me...)
Yeah, it goes through any single instance of a Forge object, no matter how many walls it has internally, like the Gulch base objects. So if you shot at the Gulch bases, it'd go through one half of the base but then "hit" against the other half, so you'd be able to x-ray shoot right into the flag room of those bases.
You also didn't need to specifically use the same object duplicated. You could put 1x1 walls embedded in the bases to stop the shot, but that of course would ramp up your object and budget real fast, so it was easier to double up the same object twice.
I actually had to implement this fix on Cragmire to accomodate the Gauss too. If you go load it up, all of the Forge cover is actually doubled up.
Sadly they never fixed the bug for the TU (or the Revenant super auto-aim for the passenger). It's strange, the bug seems to specifically be that the gauss shot simply counts how many Forge objects it's touched and stops after 1.
