Two new sights arrived just as ordered. After mounting, sighting in is a little challenging, but the supplied small screwdriver helps. Be sure to loosen the elevation and windage locking screws before adjustment, then retighten. For hard use, I recommend the metal protective bracket. Good value. I have three total, and they are about 80% as good as my Leupold Deltapoint which costs 2x as much but is built better and easier to adjust.