execute as @s run tellraw @a[tag=K] ["",{"selector":"@s","color":"white"},{"text":" has made the advancement ","color":"white"},{"text":"[","color":"dark_red"},{"text":"RAILGUN","color":"gold","hoverEvent":{"action":"show_text","value":{"text":"","extra":[{"text":"RAILGUN\n","color":"gold"},{"text":"Fired the RAILGUN","color":"yellow"}]}}},{"text":"]","color":"gray"},{"text":"."}]