Good for the money - SightMark Triple Duty Universal Laser Bore Sight

I purchased another boresight with chucks that goes into the barrel of the rifle, and it had a 12 MOA difference based on what orientation I stuck it into the barrel with. I was quite disappointed. This one by Sightmark is much more accurate and gets me within a couple MOA of zero. I do wish the "on-off" toggle was a little harder to actuate, as this can be easily turned on while it's in the carrying case in your range bag. The magnet is decently strong. Accuracy depends on how flat the end of your barrel/muzzle brake is. The light is easy to see indoors at a range of 100 yds. I bought the red one. In zeroing a red dot, I have to cycle the power on the red dot to make sure I know which one is the boresight and which one is the red dot. The battery well on this does not seem overly robust, so I do not know how long it will last.