1. Place down a command block.
2. Type this: /setblock ~ ~ ~1 redstoneblock
3. While facing north-south, 1 block away from the first command block, place another and type in /setblock ~-1 ~ ~ stone
4 place a redstoneblock block in between
5. Add another command block on whatever side of the redstoneblock and type the command below: then try shooting a bow when your done!