It had a bipod for that reason but it was almost never used that way in combat. That's why the US military gave soldiers who used the BAR a pocket at the hip that they could slide the butt of the rifle into. In this way, it was actually encouraged to be fired from the hip. Sure, it was an unwieldy weapon to fire, but it was the precursor to the modern battle rifle concept (H&K G3, FN FAL, Springfield M14).
It was an extremely effective weapon despite its shortcomings.
