When using minigun against ANY building, it wont break, when using a rocket pod (DGAR) most of the buildings (mostly small ones) will break in one shot in a pre-made destroyed model.
I know that was made to avoid Framedrops, but when you see the video of how it happends, i actually wish for Physx to also affect buildings.
This does NOT happends with the DAR in the AH-6, they act just like how they should be.