Even though the AR doesn't throw brass like a major league pitcher, when fired from the driver's window the empties tend to gravitate to the defroster vents. An inexpensive brass catcher is very helpful. Just sayin'.

Oh, and another thing - A section of split foam pipe insulation slipped over the driver's window makes a very comfortable rest, allowing for the window to be moved up and down to adjust elevation on those longer shots. Again, just sayin'...