Brian the base is a IBA 1 piece mount & rings, Rings come lapped with a 20 MOA taper. The scope ( Bushnell Elite 4.5 x 24 ) has 26.7 MOA 1/8 per click. Would be fine if I shot only 500 yards, but the range is 200 yards max. The crazy thing is, it seemed to happen after I zeroed the elevation cap to the zero mark . I could not zero at 100 yard, which was OK because I was hitting 2.5" high at 100 yards, and zero a 200. I mostly shoot 200 yds. Now at 200 yards I'm still high with no adjustment. I'm hoping I bound something when I moved the cap to zero, I do have a tendency to over tighten things.