"Userdata value" for Tool.Equipped?

Hi, I'm trying to do simple stuff with guns. Here, when the player equips the gun, all the stuff happens. However, studio says: Pistol.LocalScript:12: attempt to call field 'Equipped' (a userdata value)

Here's the LocalScript:

--defining things
local MaxAmmo = script.Parent.ClipSize.Value
local Ammo = MaxAmmo
local Reloading = false
local reloadTime = script.Parent.ReloadTime
local gun = script.Parent

--Cursor
gun.Equipped(function(Mouse)
	Mouse.Icon = "rbxasset://textures://GunCursor.png"
	script.Parent.Activated:Connect(function()
		if Ammo>0 then	
			Ammo=Ammo-1
		elseif Reloading == false then
			Reloading = true
			Mouse.Icon = "rbxasset://textures://GunWaitCursor.png"
			wait(reloadTime.Value)
			Reloading = false
			Mouse.Icon = "rbxasset://textures://GunCursor.png"
		end
		print(Ammo)
	end)
end)

Any help is appreciated!