Why Is This Sentry Gun Script Malfunctioning?

What this is supposed to do is whenever the player is near, it fires bullets at it. Here is the script:

local part = script.Parent
local player = game.Players.LocalPlayer
local damage = 10
local mouse = player:GetMouse()
local range = 100

	function Range ()
	local mag = (part.CFrame.p - player.Character.Torso.CFrame.p).magnitude
	part.Parent.Rotation = player.Character.Torso.Position	
	if mag >= range then
		local bullet = Instance.new("Part", game.Workspace)
		bullet.Name = "Bullet"
		bullet.Shape = "Ball"
		bullet.FormFactor = "Custom"
		bullet.Size = Vector3.new(0.2,0.2,0.2)
		bullet.TopSurface = "Smooth"
		bullet.BottomSurface = "Smooth"
		bullet.BrickColor = BrickColor.new("Medium stone grey")
		bullet.CanCollide = false
		bullet.CFrame = part.CFrame
		bullet.CFrame = CFrame.new(bullet.Position, player.Character.Torso.p)
		local v = Instance.new("BodyVelocity", bullet)
		v.Velocity = bullet.CFrame.lookVector * 90
		v.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
	end
	end	
	Range()

Thank you LordDragon, I fixed it on my own though, here is my new problem: The problem is at Line 7, where the while loop is introduced.

local part = script.Parent
local damage = 10
local range = 10

		game.Players.PlayerAdded:connect(function(char)
		char.CharacterAdded:connect(function()
		while (char.Character.Torso.CFrame.p - part.CFrame.p).magnitude <= range do
		local bullet = Instance.new("Part", game.Workspace)
		bullet.Name = "Bullet"
		bullet.Shape = "Ball"
		bullet.FormFactor = "Custom"
		bullet.Size = Vector3.new(0.2,0.2,0.2)
		bullet.Transparency = 0
		bullet.TopSurface = "Smooth"
		bullet.BottomSurface = "Smooth"
		bullet.BrickColor = BrickColor.new("Bright yellow")
		bullet.CanCollide = false
		bullet.CFrame = part.CFrame
		bullet.CFrame = CFrame.new(bullet.Position, char.Character.Torso.Position)
		local v = Instance.new("BodyVelocity", bullet)
		v.velocity = bullet.CFrame.lookVector * 90
		v.maxForce = Vector3.new(math.huge, math.huge, math.huge)
		part.Fire:Play()
		local hum = char.Character:FindFirstChild("Humanoid")
		hum:TakeDamage(damage)
		game.Debris:AddItem(bullet, 2)
		wait(0.5)
			end
            end)
			end)