There were times through out Inlands later production that they would run short of adjustable rear sights and would use the old flip sight just to keep the line moving. This was OK with the military as they knew down the road the rear sight would be changed for an adjustable. But the front sight was filed down for the flip sight so now with the adjustable you have to place the rear sight up higher to be able to hit on around the 100 yard mark as the front sight sits too low. If you can find a new in the wrap R marked front sight then you can replace yours and slowly file it down to the proper height. The other choice is to build the sight up with some JB weld and then file it down or leave it as is and just keep the rear at 250.