Remington IZH 94: How to regulate barrels?
 

At 50 yards the top barrel (12 gauge slug) hits about 6" left of the bottom barrel (.223). Near the pivot point is what the manual calls a changeable adjusting rod and lock nut. Of course, like most manuals, it gives no instructions. Question: Does anyone know how to manipulate this rod/nut to regulate the barrels?
Also, how do I adjust the front sight? Do I need a special tool?