Gun still shoots even after it has been Unequipped?

I recently made a ray cast gun using the wiki tutorial but i noticed that it still shoots even after it has been unequipped. I also tried adding the Equipped and Unequipped functions but to no avail as it kept saying that mouse wasn't indexed or something like that. Can anyone help me figure out why this is happening?

local tool = script.Parent
local Player = game:GetService("Players").LocalPlayer
local Shooting = true
local cooldown = 0.29
mouse_held = false
mouse = Player:GetMouse()

    mouse.Button1Down:connect(function()

        if Shooting then
        Shooting = false

        mouse_held = true
        wait(0.29)
        repeat wait()

        local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit * 300)
        local part, position = workspace:FindPartOnRay(ray, Player.Character, false, true)

        local beam = Instance.new("Part", workspace)
        beam.BrickColor = BrickColor.new("Bright Yellow")
        beam.FormFactor = "Custom"
        beam.Material = "Neon"
        beam.Transparency = 0.25
        beam.Anchored = true
        beam.Locked = true
        beam.CanCollide = false

        local distance = (tool.Handle.CFrame.p - position).magnitude
        beam.Size = Vector3.new(0.3, 0.3, distance)
        beam.CFrame = CFrame.new(tool.Handle.CFrame.p, position) * CFrame.new(0, 0, -distance / 2) --* CFrame.Angles(0,math.random(),0,0)

        game:GetService("Debris"):AddItem(beam, 0.1)

        if part then
            local humanoid = part.Parent:FindFirstChild("Humanoid")

            if not humanoid then
                humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
            end

            if humanoid then
                humanoid:TakeDamage(15)
            end
        end
        wait(cooldown)
        Shooting = true
        until (mouse_held == false)
        end
        end)

       mouse.Button1Up:connect(function()
    mouse_held = false
end)