If you want something quick to get you by here is what I did. Take a medium size cardboard box and cut a square hole on the bottom side just a little smaller than a standard sheet of paper ( about a half inch on each side) and then tape the paper over the hole tightly. Tape the lid side of the box open or tear off the 4 pieces of cardboard that make up the lid. Stand the box up in front of a bag target and your ready to start tuning. Its not very big but I can usually get 3 rows of shots from top to bottom, 5 or 6 shots in each row. I did this with the intention of building something better, but after using it I never felt the need to. No, I'm not a red neck.