Very nice scope - Barska 3-9x42 IR Contour Rifle Scope, Mil Dot IR Dual Color Reticle

first time set-up(0 at 100) was very easy and accurate. second time out started at 100 yds. was barely able to keep on paper, come to find out scope mount came loose. used blue lock tite and retighten. bingo I was back to 1" groups at 100yds. tried color reticles is ok, no use for them at this time. scope seems well made, works and looks great on ar15. time will tell for longevity.