Long story short, I cannot get my AR sighted in. Its a flat top upper with YHM BUIS setup. The gun shoots tights groups centered but about 3" to the right. Either way I adjust the rear sight, the gun still hits in the same spot which is what is freaking me out. I can adjust all the way to the right, hits right, all the way left, hits right. So, is my gun/barrel messed up or are the sights bad?? Should I take them off completely and start over? Or buy a new set and start over?? What sight do you guys recommend if so? I was thinkin Magpul. Any help would be appreciated, thanks. BTW - before you suggest its the shooter, I had 2 of my friends shoot the gun also with the same results.