I recently got a CZ SP-01 and ugraded it quite a bit. I added Dawson Precision sights. They only required slight fitting. I centered the rear sight up....I thought.....and called it good. First match didn't have any far targets really. Last Saturdays Match had a BUNCH of targets 20-25 yards away and they were mostly partials. I hit mostly hard cover and no shoots on those targets. All to the left. I sucked it up and figured I was having trigger control issues..... Then I decided to check the poi. At 25 yards I was 4 inches left. Plenty for me to call an A and hit hard cover. I moved the rear sight just a little and it hits poa/poi. Cost me quite a few points! Live and learn.