I had to remove the rear sight to install the Apex ultimate striker block assy. The rear sight was a real pain to get off. I tried lapping the bottom to smooth it out but was hesitant to go too heavy. I don't have a way of lapping the dovetails. Getting the sight back in was a trick too. I am going to sight it in this weekend but I think it will be really difficult to move the sight in small increments. On another post, I was told that 0.007" makes about a 1" POI move at 25 yards. I don't want to spend a ton of money on a sight adjustment tool. Anyone have any ideas or tricks for making the adjustment easier? Thanks.