12GA Red Dot Laser Bore Sight in-Chamber Cartridge Laser Bore Sighter with Two Sets Batteries

I used this to zero in the laser sight on my home defense shotgun. Just adjust your laser sight until two dots merge into one, and bada boom you're done. Well-built should last a lifetime.

Lite weight. Very easy to use, makes sighting in your 12g very easy and accurate. Fits perfect just like a normal shell. Made of good quality materials. I recommend this.

Works as promised

Super simple to use. Built very nicely, and feels sturdy. Made bore sighting super easy, and was very easy to see. The only thing I would change, would be a way to turn it on and off easily.

easy to use has extra batteries good quality and craftmanship

Very happy with the functionality brightness and build quality! Fit perfectly in my Remington 870 And helped me sight in a red dot optics!

While this works as described, and seems to be accurate (haven't been to the range yet), the instructions say to unscrew the battery cap a bit to turn it off. Nope, it does not turn off, as the batteries still touch the sides of the battery compartment (which is connected to the (+) of the circuit. Thus, you have to completely unscrew the cap and remove the batteries to turn it off. A minor annoyance, but otherwise it seems to work well.The instructions also say to not close the breech, because the extractor could damage the item. But without the breech closed, the shell is loose and can move in the chamber, and can therefore not be considered to be accurate. I noticed no damage to the device when ejecting the shell by normally racking the ejector mechanism, so not sure what they are on about.

Brand new AR12 with new optics. Aligned the optics to the beam at night as to see the beam at greater distance. Tweaked the optics to get dead center at 50 feet and waited till morning. Brand new shotgun and optics and nailed the target on first shot. Couldn't be happier.