Alright shooters I need some advise again. Im wanting to build a backstop at my house because i dont have any hillside to shoot into. What ive been thinking about doing is just building a wood backstop. The idea in my head at the moment is 2 4x4's upright and either stack up 4x4s in between or put 2x on the front and back of the upright 4x4s. Has anyone ever done this or seen it done this way? Im only shooting 9mm and .22s.