Mouse.Hit.p not functioning with Mobile?

I'm making a gun for my game and in my local script where I detected it shooting when a player taps, No errors, Can anyone help?

Client:

UIS.InputBegan:Connect(function(input, gameProcessedEvent)
	if input.UserInputType == Enum.UserInputType.Touch then
		if debounce == false then

			debounce = true

			script.Parent:FindFirstChild("Shoot"):FireServer(mouse.Hit.p)

			wait(5)

			debounce = false

		end
	end
end)

Server:

local debris = game:GetService("Debris")
local gun = script.Parent

local shootRE = gun:FindFirstChild("Shoot")

shootRE.OnServerEvent:Connect(function(player, mousePos)
	
	gun:FindFirstChild("Handle"):FindFirstChild("GunShot"):Play()
	
	local raycastParams = RaycastParams.new()
	raycastParams.FilterDescendantsInstances = {player.Character}
	raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
	
	local raycastResult = workspace:Raycast(gun:FindFirstChild("Handle").Position, (mousePos - gun:FindFirstChild("Handle").Position) * 300, raycastParams) 
	
	if raycastResult then
		
		local hitPart = raycastResult.Instance
		local model = hitPart:FindFirstAncestorOfClass("Model")
		
		if model then
			if model:FindFirstChild("Humanoid") then
				model:FindFirstChild("Humanoid"):TakeDamage(100)
			end
		end
		
	end
	
	local cloneBullet = Instance.new("Part")
	cloneBullet.Shape = "Ball"
	cloneBullet.Size = Vector3.new(0.218, 0.218, 0.218)
	cloneBullet.Material = Enum.Material.Metal
	cloneBullet.Transparency = 0.5
	cloneBullet.Name = "Bullet"
	cloneBullet.Position = mousePos
	cloneBullet.Anchored = true
	cloneBullet.Parent = workspace
	
	gun:FindFirstChild("Handle"):FindFirstChild("Reload"):Play()
	
	wait(5)
	
	cloneBullet:Destroy()
	
end)