You need to know how to use this to make it work - NcSTAR Gun Accessory - Laser Bore Sighter TLZ

Most people do not know how to use a bore sighter like this. You have to bench mount your gun in a gun vise, insert the arbor, attach the laser then mark the position of the laser on the target. Once you have done this, remove and rotate the arbor 90 degrees and repeat. Do this for 4 points at 90 degrees apart then join the 4 dots with a crosshair. The bore points to the intersection. This takes the error out of the alignment of the laser. For the price, this is an adequate tool. I find that it saves me ammo in getting on the paper with the first shot. Reading all the negative reviews, I wonder, what people expect for $30? It works fine for me.
Pros: Simple, easy to use.
Cons: Not precise, requires mulitple steps to make work.

This review was written in the old system and had content requirements that are different than reviews written today.