I BELIEVE THAT IT CANNOT EXTEND PAST 12 INCHES, JUST LIKE THE STABILIZER. BUT YOU CAN CHECK IBO.NET IN THE RULES. I SHOOT A CUSTOM BOW EQUIPMENT EXTENDED ALL THE WAY OUT AND NOTHING WAS SAID. I JUST CHECKED THE RULES AND IT DOES NOT MENTION SIGHT BAR IN PARTICULAR, BUT I WOULD ON POSTULATE THAT NOTHING MAY EXTEND PAST 12 INCHES.