Tier One Picatinny rails are precision manufactured on 5 axis CNC machinery, going from round bar stock to the finished item in one operation. By doing this, there is no accuracy loss due to re-setting for different operations. All rails are made from aluminium 7075T6 and are available for various action styles. Tier One scope rails meet and exceed the manufacturing criteria set out for Mil-spec 1913 Picatinny standard. At present, rails are available for the following action styles in 0MOA or 20MOA configurations.