The Salmon River Solutions Arca Balance is made with one purpose, to give you the lightest and sleekest option for a rail at the balance point of your rifle. Made from 7075 aluminum, SRS was able to add lightening pockets while retaining strength. This rail is designed to wrap around the front action screw and mounts with two bolts in front of the recoil lug. This rail has a flat bottom and is only .250" thick. Each rail comes with 10-32 screws and M-Lok mounting hardware, to provide compatibilty with a wide range of forends.