DT...why do you need a Picatinny on the bottom? Do you have a QD bipod?

Depending on your sling type...

For traditional sling: http://www.seekinsprecision.com/sling-rail-system-2.html

For slings with QD flush cups (this is the one I have): http://www.accu-shot.com/catalog/product_info.php?cPath=23&products_id=64

JYD #121
The chief cause of unhappiness and failure is trading what you want most in life for what you want at the moment.