Yes after several hundred rounds the rear sight pin broke, I had to mess around with the front sight position and rear blade to get it to shoot center. Now it shoots straight and I peened the front sight so it wont drift over to the right it is much better. I also blacked out the white dots and had a 1mm fiber cut in the front sight and it is a pretty damn nice sight picture now. I have a question to Marstar. Can we get replacement adjustable rear and fiber front sights for these? If so I need a set.