The Sako Optilock scope base perfectly compliments Sako rifles. New features makes this scope base a trusted piece for accurate shooting. The angular design makes it easier to tighten the ring without any accidental rotation. The scope base is made of pure steel for long lasting strength. The ring insert of the inner scope is made of polymer and protects the scope tube from deforming. Sako Scope Base Optilock Blue Short Action S1A067758