local m9button = ScreenGui:WaitForChild("Frame").m9button.BUY --change this to wherever the button is located
script.Parent.Frame.m9button.BUY.Text = 'BUY - 500$P'
m9button.MouseButton1Click:Connect(function()
    local amount = 500
    if Player.Backpack:FindFirstChild('M9') or Player.Character:FindFirstChild('M9') then
            costText.Text = 'You have already bought this item!'
            wait(3)
            costText.Text = ''
    else
        if Player.leaderstats.Points.Value >= amount then
            ToolPurchase:FireServer("M9", Player.Backpack.Inventory.HasM9, amount) --for the second argument just remove the value
        else
            local pointsrequired = amount - currency.Value
            costText.Text = 'You need '..pointsrequired..' more Party Points to buy this item!'
            wait(2)
            costText.Text = ''
        end
    end
end)