Bmize,
Just going off the FA website, your gun has a 8.75 inch sight radius. According to my calculations, if your rear sight can be adjusted up and down 0.020 inches, that should be good for 9 inches of movement out at 110 yards. More than enough for a .22, I would think. If you have a set of calipers, or some other way of measuring how much your sight moves, you can calculate how far the bullet is going to move at a given distance.
Hope this helps.