https://www.twitch.tv/videos/2270625995
Would recommend to watch this as its more information than i can say in words to be exact.
2:50: The reported bug.
22:35: Armada moving hitbox vs not on cortex.
24:22: Shows another aiming bug with gauntlet/rattle that might need fixing.
25:55: Square hitbox gauntlet vs Cylindrical agitator.
Fire close to frontal agitator when coming from its idle direction.
Its 'can i hit' calculation comes from the barrel instead of its 'aimpoint'. Due to double barrel?