The Salmon River Solutions FULL-LENGTH ARCA is the lightest full-length ARCA on the market. The mounting side is slightly radiused to match the contour of any stock yet retains flats for running on a chassis, and the 'U'cutout area is designed to wrap around the nose of your bottom metal. Each rail comes with 10-32 screws and M-Lok mounting hardware, to provide compatibilty with a wide range of forends.