When a bipod is deployed in prone, it limits my vertical motion up and down. Normally, this is understandable and fine. But it doesn't take the slope of the ground into effect. So, in certain areas of the map, if I'm prone on a slope facing down and deploy my bipod, I am unable to aim my gun downwards enough to shoot anyone running up the slope in front of me.

yeah this was annoying in old insurgency too. alone with the fact that people hovered over a slope if the were prone hopefully it gets fixed at some stage.