I haven't had any problems with actually making the adjustments to zero the scope, I just wanted to know at what range to sight it in at? Right now I have it sighted in at 25yds, but at 100yds it was impacting really high (about 7in. high). Now I understand why it does this, i'm just wandering if I were to sight it in at 50yrds if it would make it a little more accurate at the 100yd range. I'm kinda wanting to make it an accurate 25yd-200ish yd gun. So at what range should I sight in my Comp M3 Aimpoint optic? Does anyone have any info/research on ballastics for an AR-15? Thanks guys!