From the looks of the second picture you can see the notch where it's supposed to be pinned. So it is set to far forward. Might have been drilled and pinned in that spot. Pop the pins out and move the sight block back until it lines up with the original notch. You may need to oversize drill and pin it back in it's place if its buggered up. Too bad you weren't any closer to me I would help you get it straight.