Despite several instances of bullet tumbling and some wild shots, plenty of rounds penetrated the windows and wall, along with wooden target cutouts inside. It was dangerous, with some rounds hitting as high as 7 feet off the ground, but it did what it was supposed to do, taking out all the bad guys and leaving Walt, lying on the floor, unharmed. To be screen-accurate, it would actually have to leave Walt, Jesse, and the evil-b&$#%@d Todd unharmed, but that's pretty close. They do lose a couple points for not activating it with a bright orange vehicle-alarm remote, but this is one of the cooler firearm tests the show has done. Watch the whole experiment above and check out the clip from the episode below.