The SRS 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, we were able to add light weighting 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. – 1.05 oz. – 3.5″ OAL – Only .250″ thick