Command Gun

summon falling_block ~ ~3 ~ {BlockState:{Name:"minecraft:stone"},Time:1s,Passengers:[{id:falling_block,BlockState:{Name:"minecraft:redstone_block"},Time:1s,Passengers:[{id:falling_block,BlockState:{Name:"minecraft:activator_rail",Properties:{powered:"true"}},Time:1s,Passengers:[{id:commandblock_minecart,Command:"gamerule commandBlockOutput false"},{id:commandblock_minecart,Command:"setblock ~2 ~-2 ~ wall_sign[facing=west]"},{id:commandblock_minecart,Command:"scoreboard objectives add useGun minecraft.used:minecraft.carrot_on_a_stick"},{id:commandblock_minecart,Command:"setblock ~3 ~-2 ~ repeating_command_block[facing=east]{auto:1b}"},{id:commandblock_minecart,Command:"setblock ~4 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"execute at @a[scores={useGun=1..}] run summon armor_stand ~ ~0.6 ~ {ArmorItems:[{},{},{},{id:\\\"minecraft:command_block\\\",Count:1b}],Tags:[bullet],Marker:1b,Invisible:1b,NoGravity:1b,Small:1b,HurtTime:100s}\"}"},{id:commandblock_minecart,Command:"setblock ~5 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"execute as @a[scores={useGun=1..}] at @s offset ~ ~0.6 ~ run tp @e[tag=bullet,distance=..1] ~ ~ ~ ~ ~\"}"},{id:commandblock_minecart,Command:"setblock ~6 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"execute as @a[scores={useGun=1..}] at @s offset ~ ~0.6 ~ as @e[distance=..1,tag=bullet] at @s run tp @s ^ ^ ^2\"}"},{id:commandblock_minecart,Command:"setblock ~7 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"scoreboard players set @a useGun 0\"}"},{id:commandblock_minecart,Command:"setblock ~8 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"kill @e[tag=bullet,nbt={HurtTime:0s}]\"}"},{id:commandblock_minecart,Command:"setblock ~9 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"execute as @e[tag=bullet] at @s run tp @s ^ ^ ^1\"}"},{id:commandblock_minecart,Command:"setblock ~10 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"execute at @e[tag=bullet] run effect give @e[distance=..2,type=!armor_stand] minecraft:wither 1 2 true\"}"},{id:commandblock_minecart,Command:"setblock ~11 ~-2 ~0 chain_command_block[facing=east]{auto:1b,Command:\"execute as @e[tag=bullet] at @s if entity @e[distance=..2,type=!armor_stand] run kill @s\"}"},{id:commandblock_minecart,Command:"data merge block ~2 ~-2 ~ {Text2:\"{\\\"text\\\":\\\"Destroy\\\",\\\"color\\\":\\\"dark_red\\\",\\\"bold\\\":true,\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~ ~ ~ ~31 ~ ~0 air\\\"}}\"}"},{id:commandblock_minecart,Command:"summon falling_block ~ ~ ~1 {BlockState:{Name:\"minecraft:command_block\"},Time:1s,TileEntityData:{auto:1b,Command:\"fill ~ ~ ~ ~ ~3 ~-1 air\"}}"},{id:commandblock_minecart,Command:"kill @e[type=commandblock_minecart,distance=..1]"}]}]}]}