Power by 3 x AG13 Batteries.22 to .50 Laser Calibrator Laser Calibration Pen Red Laser Pointer Bore Sighte

Once you figure out which size to use (because it's not as cut and dry as putting the 6mm one in the 6mm barrel), it's easy. With a little trial and error, I was able to just line my sights up with the red laser dot at about 50 feet and I can hit anything I aim at from 10 to 100 feet perfectly.

I did not buy it for any sighting, so I cannot help you there. I needed something to help with trigger pull. This did the job. The plug for the 22 fit well with no wobble, but the 9mm was way too wobbly. I used a cotton patch to make it tight and it worked. It's important the unit stays in tight, or it will fall out. The fulfillment was good, the packing was good, and the storage box will be handy. I did not have any issues with anything else. All I need now is to practice, practice, practice.

Easy to use, great value, and spot-on for accuracy.

Arrived early and worked great. I took it out of the box and checked the alignment of the laser since so many other reviews said this was a problem. Well, it wasn't a problem for mine. The laser was perfectly centered. All the rubber attachments fit my guns perfectly. I haven't tried it on the AR, but I used it to zero my red/green dot sights on my Ruger 10/22 and Ruger PC9 Carbine 9mm rifle. I went out today to shoot some rounds on paper to make final adjustments, but all my shots were dead center on both guns, so I did not need to adjust anymore. I shot about 200 rounds through the 9mm and 80 through the 22 with complete accuracy. For $18, this is a great investment. Way exceeded my expectations.

Quick delivery and the package came very well packed. Given as a gift to a friend who loves to shoot.