So I was flipping through HB:House Kurita again (and marveling at just how many aerospace units there are in it), when I stumbled across the Heavy Riot Infantry 1. They're equipped with 20 Wakazashi O-12 shotguns and 8 Bullet shields.
For the life of me, I can't find the rules for Bullet Shields. I mean, I can find them listed in ATOW, but no clue or indication as to how they're used in TW play.