The standard PSO-1 scope is often sold with what is described as an "AK style" base. While this base readily affixes to the AK receiver's side mounted scope rail, it positions the scope so far to the rear that it is rendered unusable. The Krebs Custiom PSO-1 scope base replaces the factory base in minutes (six screws), and uses the original hardware. The scope is positioned perfectly, and can be set for one of two positions to account for the individual shooter's functionality.