Did not work - Sightmark Laser Bore Sights

I used this for about 20 minutes before it started to fail. The site on this is not what was said. It stated that it can go to 100 yards and i couldn't even see it at 25 yards. I tried at 15 yards and had over adjusted then when I had disassembled it and put it away i needed to put it back together to re site and the battery was already dying and the reticle could not be seen at all it seemed like my barrel was bent and when another person at the range used a different one did i find out the at wasn't my barrel it was the sight-mark. not happy i ended up using 80 rounds to finally get my scope sighted in.