This collection contains a Picatinny rail for the Sako 90 with the new Optilock interface. JK-N machines it from steel in the Czech Republic.
A Picatinny rail is a scope base screwed to the receiver. It takes Picatinny scope rings, scope mounts and other optics. Most Weaver rings fit it too. For rings, see Scope rings for Picatinny base. For all rails, see Picatinny rails.
Yes, no gunsmith is needed. Clean the receiver and the screws, put a drop of threadlocker on each screw and tighten them evenly to the torque given by the maker.
Which scope rings fit the rail?
Any Picatinny rings, and most Weaver rings. Choose the ring diameter by the main tube of your scope. See Scope rings for Picatinny base.