A budget ACOG red dot sight. I researched the product online before I bought it. Seems like about 50% of folks like it and have had no problems with it. The other half consider Barska and other budget sights like NC Star, Leapers, etc., junk. After 600 rounds through my AR, mine is holding zero just fine. I bought the sight to see if I would like it turns out I like using a non-magnification red dot sight. So...if it holds up that's fine. If it doesn't, I know that I will definitely buy another red dot of higher quality (and price) from a different manufacturer. Anyway, it definitely served it's purpose as a "test" sight, and so far, I have not complaints.