I purchased my PT 1911 about 1 1/2 year ago. I took it out to the range and it functioned amazingly, except that i noticed the rounds grouped nicely about 4 inches below the point of aim at 15 yards. I figured maybe after the break-in of about 500 rds that this would improve. It hasn't, it runs smoothly except that i have to compensate for the low impact of my rds. Does anyone have suggestions on possibly changing my rear sight to something that can be elevation adjustable so my rds are hitting at point of aim?