Weapon Ammo counter not working?

Hello, Ive been working on a custom weapon for my game and have come across this peculiar issue. I had previous success counting down the ammunition by using a separate localscript from the raycasting/main one, but it fails to disable the raycasting script for some reason so I am trying to put the counter in the raycasting script instead.

When printing "Ammo", it always shows up as 12, which means its not updating the value for some reason?

local ammo = 12
local cooldown = 1.5

tool.Equipped:connect(function(mouse)
	user = tool.Parent 
mouse.Button1Down:connect(function()
		if ammo >= 1 then
		print(ammo)
		local ray = Ray.new(tool.Barrel.CFrame.p, (mouse.Hit.p - tool.Barrel.CFrame.p).unit*300)
		local hit, position = game.Workspace:FindPartOnRay(ray, user)
		local distance = (position - tool.Barrel.CFrame.p).magnitude
		local rayPart = Instance.new("Part", user)
		rayPart.Name          = "RayPart"
		rayPart.BrickColor    = BrickColor.new("Neon orange")
		rayPart.Material	  = Enum.Material.Neon
		rayPart.Transparency  = 0
		rayPart.Anchored      = true
		rayPart.CanCollide    = false
		rayPart.TopSurface    = Enum.SurfaceType.Smooth
		rayPart.BottomSurface = Enum.SurfaceType.Smooth
		rayPart.formFactor    = Enum.FormFactor.Custom
		rayPart.Size          = Vector3.new(0.2, 0.2, distance)
		rayPart.CFrame        = CFrame.new(position, tool.Barrel.CFrame.p) * CFrame.new(0, 0, -distance/2)

		local SpawnPos = script.Parent.Parent.PrimaryPart
		local Fire = script.Parent.Handle.Fire
		local Reload = script.Parent.Handle.Load
		local stinger = script.Parent.Stinger
		local humanoid = hit and hit.Parent and hit.Parent:FindFirstChild("Humanoid")
		script.Disabled = true

		if humanoid then
				ammo = (ammo - 1)
				tool.Name = ammo
			Fire:Play()
			stinger.Transparency = 1
			Remote:FireServer(humanoid, SpawnPos)
			game.Debris:AddItem(rayPart, 0.02)
			local reloading = script.Parent.Parent.Humanoid:LoadAnimation(script.Reload)
			reloading:Play()
			wait(cooldown)
			Reload:Play()
		else 
			script.Parent.Handle.Miss:Play()
			stinger.Sparks.Enabled = true
			wait(.1)
			stinger.Sparks.Enabled = false
		end 
		game.Debris:AddItem(rayPart, 0.02)
		script.Parent.Stinger.Transparency = 0
			script.Disabled = false
			end
		end)
end)

Im not sure what Im doing wrong. I also only want it to count down if it hits a humanoid and deals damage, which is why the equation is where it is.

I found the solution. Disabling the script after every shot caused the Ammo value to reset to 12. I fixed this by implementing a debounce.

local ammo = 12
local cooldown = 1.5
local debounce = false

tool.Equipped:connect(function(mouse)
	user = tool.Parent 
mouse.Button1Down:connect(function()
		if ammo >= 1 and not debounce then
			debounce = true