Make sure to order Barrett rings at the same time as the BORS unit mounts on the rear ring. Several different sets are available.
Pros: Fantastic product-I own two because they now come with windage computation in addition to elevation.
Cons: Make absolutely sure you order the correct unit. Look at the elevation knob to see the numbers on the side. If there are zero to nineteen the BORS elevation knob should have the same markings.
This review was written in the old system and had content requirements that are different than reviews written today.