Super accurate gun in vanilla minecraft | no mods-one cm edition

summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:gamerule commandBlockOutput false},{id:MinecartCommandBlock,Command:scoreboard objectives add shot stat.useItem.minecraft.carrot_on_a_stick},{id:MinecartCommandBlock,Command:setblock ~2 ~-3 ~ repeating_command_block 1 replace {auto:1,Command:"/execute @a[score_shot_min=1,score_shot=1] ~ ~ ~ summon ArmorStand ~ ~ ~ {ArmorItems:[{},{},{id:elytra},{}],CustomName:\\\"bullet\\\",Invisible:1b}"}},{id:MinecartCommandBlock,Command:setblock ~2 ~-2 ~ chain_command_block 9 replace {auto:1,Command:"/execute @p[score_shot_min=1] ~ ~ ~ tp @e[type=ArmorStand,name=bullet,r=0] @p[score_shot_min=1]"}},{id:MinecartCommandBlock,Command:setblock ~2 ~-1 ~ chain_command_block 9 replace {auto:1,Command:"/scoreboard players set @a[score_shot_min=1,score_shot=1] shot 0"}},{id:MinecartCommandBlock,Command:setblock ~2 ~ ~ chain_command_block 9 replace {auto:1,Command:"/execute @a ~ ~ ~ execute @e[type=ArmorStand,name=bullet,r=0] ~ ~ ~ tp @e[type=ArmorStand,name=bullet,r=0] ~ ~5 ~"}},{id:MinecartCommandBlock,Command:setblock ~2 ~1 ~ chain_command_block 1 replace {auto:1,Command:"/entitydata @e[type=ArmorStand,name=bullet] {FallFlying:1b}"}},{id:MinecartCommandBlock,Command:setblock ~2 ~2 ~ chain_command_block 1 replace {auto:1,Command:"/scoreboard players set @e[type=ArmorStand,name=bullet] shot 1 {OnGround:1b}"}},{id:MinecartCommandBlock,Command:setblock ~2 ~3 ~ chain_command_block 1 replace {auto:1,Command:"/execute @e[type=ArmorStand,name=bullet] ~ ~ ~ summon FallingSand ~ ~ ~ {TileID:51,Time:1b}"}},{id:MinecartCommandBlock,Command:setblock ~2 ~4 ~ chain_command_block 1 replace {auto:1,Command:"/execute @e[type=ArmorStand,name=bullet,score_shot_min=1] ~ ~ ~ summon Creeper ~ ~ ~ {ExplosionRadius:10b,Ignited:1b,Fuse:0s}"}},{id:MinecartCommandBlock,Command:setblock ~2 ~5 ~ chain_command_block 9 replace {auto:1,Command:"/execute @e[type=Creeper] ~ ~ ~ kill @e[type=ArmorStand,name=bullet,r=1]"}},{id:MinecartCommandBlock,Command:setblock ~3 ~-1 ~ wall_sign 5 replace {Text1:"{\\\"text\\\":\\\"My channel\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/tellraw @a [\\\\\\\"\\\\\\\",{\\\\\\\"text\\\\\\\":\\\\\\\"Remember to take a look of my channel: \\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"gold\\\\\\\"},{\\\\\\\"text\\\\\\\":\\\\\\\"My channel\\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"dark_aqua\\\\\\\",\\\\\\\"clickEvent\\\\\\\":{\\\\\\\"action\\\\\\\":\\\\\\\"open_url\\\\\\\",\\\\\\\"value\\\\\\\":\\\\\\\"https://www.youtube.com/channel/UC3_Gm-pfskCh2bnzcekR0ow\\\\\\\"}}]\\\"}}",Text2:"{\\\"text\\\":\\\"\\\",\\\"color\\\":\\\"aqua\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/execute @a ~ ~ ~ playsound minecraft:entity.experience_orb.pickup voice @a ~ ~ ~ 12 1 1\\\"}}",Text3:"{\\\"text\\\":\\\"\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"2\\\"}}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"3\\\"}}"}},{id:MinecartCommandBlock,Command:setblock ~ ~ ~1 command_block 0 replace {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:MinecartCommandBlock,Command:setblock ~ ~-1 ~1 redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}]}]}