Getting the decimal percent of a scale help?

So I'm trying to make the bar scroll to the amount left in the gun but nothing is happening

someone wanted the full script, so: (look at the reload section)

----------------------------------------------------------------------------
repeat wait() until game.Players.LocalPlayer
globmod = require(script.GlobalRuns)
local tool              = script.Parent
local handle            = script.Parent.shoota
local shooter           = tool.shoota
local mouse             = game.Players.LocalPlayer:GetMouse()
local player            = game.Players.LocalPlayer
local Character         = player.Character
local mousedown         = false
local bulletvelocity    = 150
local betweenshot       = .18
local currentamount     = 12 --the one below should be the same ammount
local afterreload       = 12
local maxammo           = 144 --again same as below
local currentmax        = 144 
local emit              = true
local dmgmin            = 10
local dmgmax            = 15
local contextAction     = game:GetService("ContextActionService")
local reloading         = false
local amIreloading      = false
local running           = false
----------------------------------------------------------------------------
local enabled = false
game.Players.LocalPlayer.Character.Humanoid.Running:connect(function(speed)
    if enabled == true then
        if speed > 6 then
            running = true
            print("running")
        else
            print("notrunning")
            running = false
        end
    end
end)

script.Parent.Equipped:connect(function()
    enabled = true
    local clonegui      = script.Parent.ToolGui:Clone()
    clonegui.Parent     = game.Players.LocalPlayer.PlayerGui
    ammotext            = clonegui.GunFrame.AmmoAmount
    ammoimage           = clonegui.GunFrame.ImageLabel
    ammotext.Text       = currentamount
    local sound         = script.Parent.Handle.Sound
    script.Parent.Unequipped:connect(function()
        clonegui:Destroy()
        enabled = false
    end)
end)
local scrollmax = game.Players.LocalPlayer.PlayerGui.ToolGui.GunFrame.AmmoAmount.Background.TextLabel
-------------------------- mousedown manager ------------------------------
mouse.Button1Down:connect(function()
    mousedown = true
end)
mouse.Button1Up:connect(function()
    mousedown = false
end)

--------------------------------particleemitter maker----------------------------------

local emit = function(part)
    local emitter = Instance.new("ParticleEmitter", part)
    emitter.EmissionDirection = Enum.NormalId.Back
    emitter.Size = NumberSequence.new(10)
    emitter.Transparency = NumberSequence.new(0.4,0.7)
    emitter.Texture = "http://www.roblox.com/asset/?id=241685484"
    emitter.Speed = NumberRange.new(0)
    emitter.Acceleration = part.CFrame:inverse().p
    emitter.Lifetime = NumberRange.new(.1)
    emitter.Rate = 50
    emitter.Color = ColorSequence.new(Color3.new(0,0,255), Color3.new(255,255,255))
end

------------------------------ welding ------------------------------------
local Weld = function(x, y)
    local W = Instance.new("Weld")
    W.Part0 = x
    W.Part1 = y
    local CJ = CFrame.new(x.Position)
    local C0 = x.CFrame:inverse()* CJ
    local C1 = y.CFrame:inverse()* CJ
    W.C0 = C0
    W.C1 = C1
    W.Parent = x
end
---------------------------------------------------------------------------

Weld(handle, shooter)
function checkifplayer(hit)
    if tostring(hit:GetFullName()):match(player.Name) then
        return true
    else
        return false
    end
end


--------------------------------- reload ---------------------------------
function reload()
    if amIreloading == false then
        amIreloading = true
        ammotext.Text = "      Reload      "
        scrollmax.BorderColor3 = Color3.new(255/255,0,0)
        scrollmax.Size = UDim2.new(currentmax/maxammo,0,scrollmax.Size.Y.Scale,0)
        scrollmax.BorderColor3 = Color3.new(255/255,255/255,255/255)
        wait(2)
        amIreloading = false
        currentamount = afterreload
        ammotext.Text = currentamount
    else
        print("holdingmouseclick")
    end
end
------------------------------ bullet script ------------------------------
local shootbullet = function(startpos, endpos)

    local magnitude         = (startpos - endpos).magnitude
    local part              = Instance.new("Part")
    if emit == true then emit(part) end
    part.Anchored           = false
    part.CanCollide         = false
    part.CFrame             = shooter.CFrame
    part.BrickColor         = BrickColor.new("Bright yellow")
    part.FormFactor         = Enum.FormFactor.Custom
    part.Size               = Vector3.new(0.1,0.1,0.1)
    part.TopSurface         = Enum.SurfaceType.SmoothNoOutlines
    part.BottomSurface      = Enum.SurfaceType.SmoothNoOutlines
    part.Transparency = 1

        spawn(function() script.Parent.shoota.BillboardGui.ImageLabel.ImageTransparency = 0 wait(.05) script.Parent.shoota.BillboardGui.ImageLabel.ImageTransparency = 1 end)

        local bodyForce = Instance.new('BodyForce', part)
        bodyForce.Name = 'Antigravity'
        bodyForce.force = Vector3.new(0, part:GetMass() * 196.8 - .12, 0)

        local spawnPosition = (handle.CFrame * CFrame.new(0, 0, 0)).p
        part.CFrame = CFrame.new(spawnPosition, mouse.Hit.p) 

        part.Velocity = part.CFrame.lookVector * bulletvelocity
        part.Parent = workspace

        return part 
end
---------------------------------ammo function-------------------------------------------------

function assumeLargerPosition()
    ammotext.TextColor3 = Color3.new(1,1,1)
    ammoimage.ImageColor3 = Color3.new(1,1,1)
    ammotext:TweenSizeAndPosition(UDim2.new(0.1, 0,0.06, 0),UDim2.new(0.88, 0,0.905, 0),"Out","Quad",1/30, true) ammoimage:TweenSizeAndPosition(UDim2.new(0.07, 0,0.07, 0),UDim2.new(0.904, 0,0.847, 0),"Out","Quad",1/30, true)
end

function assumeSmallerPosition(times)
    ammotext.TextColor3 = Color3.new(175/255,175/255,175/255)
    ammoimage.ImageColor3 = Color3.new(200/255,200/255,200/255)
    ammoimage:TweenSizeAndPosition(UDim2.new(0.05, 0,0.05, 0),UDim2.new(0.912, 0,0.866, 0),"Out","Quad",times, true) ammotext:TweenSizeAndPosition(UDim2.new(0.1, 0,0.04, 0),UDim2.new(0.88, 0,0.915, 0),"Out","Quad",times, true)

end

function shootgui()
    assumeLargerPosition()
    wait(betweenshot*3)
    assumeSmallerPosition(betweenshot*3)
end

function updateammo()
    ammotext.Text = currentamount
end

function CheckAmmo()
    if currentamount == 1 or currentamount < 1 then
        assumeSmallerPosition()
        reload()
        amIreloading = false
        return false
    else
        return true
    end 
end

---------------------------------shoot function------------------------------------------------

local clickdeb = true

mouse.Button1Down:connect(function()
    if clickdeb then
        clickdeb = false
        if CheckAmmo() then
            currentamount = currentamount - 1
            spawn(function() updateammo() wait(.2) shootgui() end)
            local bullet = shootbullet(shooter.CFrame.p, mouse.Hit.p)
            local damage = math.random(dmgmin,dmgmax)
            bullet.Touched:connect(function(hit)
                if hit.Name == "Head" then damage = damage * 3 end
                globmod:hurt(hit.Parent,damage)
                bullet:Destroy()
            end)
        end
        wait(betweenshot)
        clickdeb = true
    end
end)



--------------------------------- Binding ---------------------------------

contextAction:BindAction("openDoor", openDoorFunction, false, Enum.KeyCode.ButtonX)