All, I tried to zero my D2 yesterday using the parallel method. Because I have a lack of real estate on the top I mounted it on the left side. I had centered the adjustments before mounting but I was about 4 inches off on elevation and an out 6 off on windage with the unit mounted on the left side. I switched over on the right side and I got closer but still of 4 inches on windage and elevation. I tried this at 25 yards following the video linked below. Also I moved out to 50 yards hoping I would be closer but nope, that was off too. So does anyone have any suggestions? Rifle is an AR-10 with a 3-18 Razor in Midwest Mount, NV is a Armasite clip CO-X and a Sionyx sport on a bump helmet.