Why do you need the adjustable sight?
If you need to change the POA, specially if your gun is shooting higher, get a higher front sight. Factory sight height is 5.5mm, and every 0.5mm is about 3" at 25mtrs. But the POI will change with ammunition, an inch here or there. For precise work, you will have to get some other model of adjustable sights.
And +1 to Admiral Ackbar also..