My find; Water mill on Homestead can't be shot through.
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It was on the more open ended map (big grassy field one). I shot my grappling hook at the edge of a building during Evac and it somehow dragged me all the way into the second room of the building. I don't think i saved a clip though.
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It was like a solid box. You could take cover by it on the roof, but it would block your shots!