Here's what you need:
-Electrical tape
-Sharp knife, whether X-Acto, box cuttter, or pocketknife.
Here's what you do:
- Put tape across top surface of front sight
- Carefully trim with knife so tape does not make foresight wider; all the tape should be on the top flat surface of the foresight ONLY
- Fire for effect, five rounds minimum
- Repeat process until rifle hits where you want it to
That's the low-buck, totally reversible way to bring your Point of Impact down on an arm that sights of differing heights might not be readily available for.
Sounds like it might be dead on at 100 yards to me, where does it hit at 25 yards? You might be right on at 25 and again at 75 and high only at 50....