How do I make a Gui not appear to a team?

Hi, sorry for having another question so quickly but I'm only learning. I want to make a gui not appear to a team because I have a visitor's team for my place and I don't want them to be able to harm the group team, allies, or raiders. this is my script right now, in a script under the StarterGui-

function PlayerAdded(player) if player.TeamColor == ("Mid gray") then script.Parent.SelectGun:Destroy() end end

It seems to have no effect,.

Thanks for checking it out.

Thanks to ImageLabel for sorting my issue! He got it perfect in his comment, with a step by step guide.

You can always try parenting the Gui itself to ReplicatedStorage and only cloning it to the PlayerGuis of those that matched the set requirements.

local replicated = game:GetService('ReplicatedStorage')
local guiFile = 'SelectGun' 
local players = game:GetService('Players')
local exempt = BrickColor.new('White') 

Edit exempt to TeamColor that should be exempt from distribution (above)

players.PlayerAdded:connect(function (player)
	local playerGui = player:WaitForChild('PlayerGui')
	local clone = replicated:WaitForChild(guiName)

	player.Changed:connect(function (property)
		if property == 'TeamColor' then
			if (not player[property] == exempt) then
				if (not playerGui:FindFirstChild(guiFile)) then
					clone:Clone().Parent = playerGui
				end
			end 
		end
	end)
end)

line 2 = finding or waiting for the player's PlayerGui

line 3 = finding or waiting for the pre-defined "gui" we want to clone

line 4 = fires when a property of player is changed

line 5 = if the changed property is TeamColor then go on

line 6 = if the TeamColor's set value does not equal the pre-defined exempt TeamColor value then go on

line 7 = if the gui doesn't already exist in the player's PlayerGui then go on

line 8 = clone the pre-defined guiFile

done!