Catching arrows in one-command! 1.9 only

I have made a one-command for catching arrows with a "Arrow catching" device. all you need to do is copy the command at this link: http://pastebin.com/G94kZgDt do /gamerule commandBlockOutput false Then, /give @p minecraft:command_block place the command block NEAR SPAWN(Important so it stays loaded) open it, paste the command in, click done and then power it!
It will build itself and then you can drop 1 leather and 1 iron on the diamond block to get 3 arrow catchers(In case you die)
Warning: They don't always work, this is intentional as it would be way to OP if it worked every time.