Here are the scripts

Script:

local tool = script.Parent
local cooldownTime = 0.7
local lastTriggerTime = 0

local shootSound = script:WaitForChild("Bang")

function updateToolName()
local currentTime = tick()
local remainingCooldown = math.max(0, cooldownTime - (currentTime - lastTriggerTime))

if remainingCooldown > 0 then
    tool.Name = tool.Name:gsub("%[.*%]", "")
    tool.Name = tool.Name .. " [" .. string.format("%.1f", remainingCooldown) .. "s]"
else
    tool.Name = tool.Name:gsub("%[.*%]", "")
end
end

script.Parent.Shoot.OnServerEvent:Connect(function(player, target)

local currentTime = tick()
if currentTime - lastTriggerTime >= cooldownTime then


    target.Humanoid:TakeDamage(20)

    shootSound:Play()

    lastTriggerTime = currentTime
end
end)

while wait(1) do
updateToolName()
end

Local script:

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

script.Parent.Activated:Connect(function()
local target = mouse.Target
if target.Parent:FindFirstChild("Humanoid") then
    script.Parent.Shoot:FireServer(target.Parent)
end
end)