Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Seemed like it was too good to be true and it was.

Great concept. Use one device to zero in all of your guns regardless of caliber. Unfortunately, the laser operated sporadically from day one. In addition, I tried to use this in my M4 and it wouldn't work. It actually won't work with any gun with a muzzle compensator. Save your money...