This script works in Roblox Studio but not in the actual game?

So this script for some reason doesn't work inside the actual game, but if I test it in Roblox Studio it works?

local ShopButton = script.Parent
local Shop = script.Parent.Parent.Frame 
local Close = script.Parent.Parent.Frame.X
local GunGUI1 = Shop.Gun1
local GunGUI2 = Shop.Gun2
local Gun1 = game.ServerStorage:FindFirstChild("Gun1")
local Gun2 = game.ServerStorage:FindFirstChild("Gun2")
Player = game.Players.LocalPlayer

ShopButton.MouseButton1Down:connect(function()
	ShopButton.Visible = false
	Shop.Visible = true
	Close.MouseButton1Down:connect(function()
		ShopButton.Visible = true
		Shop.Visible = false
	end)
end)

GunGUI1.MouseButton1Down:connect(function()
	if Player.Backpack:FindFirstChild("Gun2") and Player.StarterGear:FindFirstChild("Gun2") then
		Player.Backpack.Gun2:Destroy()
		Player.StarterGear.Gun2:Destroy()
	end
	local Gun1C = Gun1:Clone()
	Gun1C.Parent = Player.Backpack
	local Gun1D = Gun1:Clone()
	Gun1D.Parent = Player.StarterGear
	GunGUI1.Visible = false
	GunGUI1.Text = ("Bought")
	GunGUI2.Visible = true
	GunGUI2.Text = ("Gun2")
end)

GunGUI2.MouseButton1Down:connect(function()
	if Player.Backpack:FindFirstChild("Gun1") and Player.StarterGear:FindFirstChild("Gun1") then
		Player.Backpack.Gun1:Destroy()
		Player.StarterGear.Gun1:Destroy()
	end
	local Gun2C = Gun2:Clone()
	Gun2C.Parent = Player.Backpack
	local Gun2D = Gun2:Clone()
	Gun2D.Parent = Player.StarterGear
	GunGUI2.Visible = false
	GunGUI2.Text = ("Bought")
	GunGUI1.Visible = true
	GunGUI1.Text = ("Gun1")
end)