It is used on a newly bought Ruger mini-14 Target rifle in .223 caliber. I initially sighted it in and was getting excellent shot groups at 100 yards using factory loads (40 rounds). The next time I went to the range it held its zero for another 10 shots, for a grand total of 50 rounds of Black Hills factory ammo. All of a sudden aI lost my zero by 2" low and 1/2" right. I noticed that the reticle shifted slightly left. All mountings were secure.
Pros: Excellent price
Cons: Won't hold zero
This review was written in the old system and had content requirements that are different than reviews written today.