I recently purchased a gun with a Grayboe Ridgeback stock. It currently has a picatinny rail mounted to the slots (mlok?) on underside of rifle. I have an Atlas V8 bipod with the ADM quick release mount mounted to this rail. Id like to have an ARCA rail on the rifle to facilitate attachment to my tripod (which has a RRS attachment for ARCA rails) but I also want to be able to use the Atlas bipod. What parts do I need to accomplish this?