When using an ARCO scope (I have tried on a katiba, MX, and a EBR) the point of impact will be at the correct range but will be to the right around the numbers on the reticule. This is not a large amount but it still needs to be fixed because the sight is basically unusable for longer ranges.
Edit: I have now tried with all firearm groups and the problem is persistent with all of them. I have also tried different scopes and they work fine so I know the issue is with the arco in particular.
Place ARCO on a katiba, mx, or ebr and shoot at any distance. (will be easier to see at farther ranges) Notice bullet impact is to the right around the area where the range numbers are located instead of on the center post where the rounds should impact.
I will be testing the ARCO on other weapons to determine if it is just those mentioned or if it is the scope in general. From what I have gathered the ARCO has been modified before because the reticule was actually offset to the right of the front post so this problem may have stemmed from that being fixed but the point of impact not being changed as well.