Went and shot my new DPMS today, first 5 shots I could not hit a target at 20 yds! Finally realized when I bought sights I did not buy a front sight for a lowered gas block. So I was shooting right over my target. Now once I realized what was going on and after feeling stupid, I was able to aim about 8 inches lower than what I wanted to hit and all was good.
Pay attention to what you are buying was my lesson for the day.