The Ruger 1913 Picatinny rail is a standard factory replacement part. This picatinny rail is for Mark IV, Mark III, and 22/45 model pistols which have factory pre-drilled receivers to accept mounts. This mount is made by Ruger and as such you can be assured that this mount is made to the specifications and tolerances set forth by the factory. This will ensure perfect fit and excellent operation.

Specifications and Features:
Ruger Genuine Factory Part 90623
1913 Style Picatinny Top Rail
Perfect for Mounting Optics
3 Screw Pattern
Matte Black

Fits:
Ruger Mark IV and Mark III and 22/45 Pistols with factory pre-drilled receivers
Note: Will not fit Mark I and Mark II pistols