No, I don't use anything extra on the gun. I use it as it came out of the box. But I just can't make sense of it. When I aim at the center of the target, the bullet goes to the left. When I aim a little to the right of the target, it hits the target. I'm starting to think it's a factory defect. Normally, if the bullet is going left, the rear sight should be pulled to the right. but even though I pull to the far right, it still goes to the left.