Buyer BEWARE UPDATED Used ACOGs, EoTechs
Changed to three stars. Couldn't give up on this sight because it has too much potential and it comes from an American company. It occurred to me that "battery bump" might be interpreted by a digital circuit to be a power-off event, i.e. it thinks you turned the sight off. In an analog circuit the sight would just flicker if it momentarily lost power from battery bump. The spring in the battery compartment on my sight was "just" long enough to reach the batteries, but didn't compress. I replaced it with a 1/4 inch spring from my parts bin and solved the problem. The sight doesn't turn off when bumped now. If your sight is turning off or dimming when bumped or on recoil, try replacing the battery spring or stretching it a little bit. You want it to be 1/4 inch long. Haven't shot with the sight yet so don't know about holding zero. Will update again after some range time now that the sight stays on.
Original one-star post:
Buyer BEWARE UPDATED Used ACOGs, EoTechs
I'm retired military. Used ACOGs, EoTechs, iron sights, everything. Also CEO of an electronics engineering company. (Not firearms related). So I liked the possibilities of this sight but saw a lot of bad reviews. Decided to buy one from a local store in case things went bad. The store had 3, two of which were returns... I got the new one. Seemed to work OK at the store. Once home, noticed sight kept turning off. Started troubleshooting. Found that even a slight tap on the side of the unit would power-off the sight. I believe this is a manufacturing problem since some of the sights work and some don't. Probably related to the "digital" switch circuit. I went to Sightmark's website to see if any of this had been documented. It seems they have closed comments on this sight...but are displaying nothing but good comments...hmmm... If you have a good sight, that's great. But the problems people are having with this sight are real, and I hope Sightmark will fix it.
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