Why does this math.random script always give me the same tool?

I'm trying to use a ClickDetector in a part to give the player who clicks it a random weapon, but everytime I click it I get the same thing.

Code:

local gamepassID = 510675750
local weapons = game.ServerStorage.Weapons:GetChildren()
local random = weapons[math.random(1, #weapons)]

script.Parent.ClickDetector.MouseClick:connect(function (playerWhoClicked)
    local player = playerWhoClicked
    local mps = game:GetService("MarketplaceService")
    local playerHasPass = mps:PlayerOwnsAsset(player, gamepassID)

    if playerHasPass then
        random:Clone().Parent = player.Backpack
    else
        mps:PromptPurchase(player, gamepassID)
    end
end)

Don't know why I'd have to say this, but yes, there is more than one tool in the folder (duh)