Mine is installed on a Bushmaster, and when they work, they are great. However I had issues with POI shifting after riding in the trunk for a week.
After that, taken to the range, the rifle just would not group and the average POI was shifted 1.5" and the group would be like 2". Once I tweak the windage turret the POI would jump back where it should have been, and the group would come back to 0.75" for 5 shots, like it should be.
No idea why this happens.
Other than this and the field curvature, I like the Burris for the toughness. The field curvature and the tiny amount of parallax that is not correctable with the AO that my scope has, makes me think I wouldn't hurry back to buy another.