Creedmoor UBR Gen 2 Sling Loop Introducing Creedmoor's UBR Gen 2 Sling Loop for Magpul UBR Stocks. This minor addition to your buttstock allows you to route your Turner, Ron Brown, Military Web, Turner All Weather, or Jim Owen's No Pulse sling through the traditional, down facing sling mount not available through the UBR Stock. The addition of this plate is simple with no complex tools required and can be completed in less than ten minutes.