Why wont the script allow it to keep the weapon?

So, I have this figure in which you talk to him to buy the weapons. Now when you buy it you receive it fine, but when you die or reset, it's gun and to get it again you have to buy it again. How can I fix this? Thanks!

script.Parent.DialogChoiceSelected:connect(function(player, choice)
	if (choice:findFirstChild("Cost")) then
		if (player.leaderstats.Money.Value >= choice.Cost.Value) then
			if (game.Lighting:findFirstChild(choice.Name)) then
				player.leaderstats.Money.Value = player.leaderstats.Money.Value - choice.Cost.Value
				local gun = game.Lighting:findFirstChild(choice.Name):clone()
				if (gun.className == "Panzerfaust") then
					gun.Parent = player.Backpack
				else
					gun.Parent = player.Character
				end
			end
		end
	end
end)