Bore Sight Laser 223 5.56mm/9mm/.243.308/12Gauge/7.62x39mm/.45acp Red Laser Bore Sighter with Batteries

Works as intended. Got my 0 done with in a couple minutes!! My only issue was getting the laser out of my Glock when I was done, but I just popped it out with a cleaning tool and it came out easily. I have no idea how long those batteries last because I did mine so fast, but it works. 5 stars because it was delivered fast, decently priced, easy to use, accurate, seems durable and the laser is nice and bright.

Since there isn't much to a laser bore sight, I figured I'd give this more cost effective model out; it turns out to exactly what it claims to in the description. I used this in my G17 and found it very easy to feed into the barrel from the top of the slide. Couple things probably worth mentioning. First, it is true that as long as the batteries are in the device, it will remain on--so take the batteries out after each use. Second, the fit inside the barrel is spot on, but it can cause the device to get stuck in the chamber. Since there is no real "lip" on the device like on the back of a 9mm casing, there is nothing for the extractor to grip, causing it to remain lodged in the barrel. If you simply grab your cleaning rod and give it a firm poke on from the other side of the barrel, it will dislodge the device. Third, this is a rather "cost effective" device, meaning you probably would be best to not slam the slide closed on it (or dry fire with it in the chamber), as this would probably damage the device. Seems to work rather well; helped me correct my rear sights that were off center a bit to the left.

Works fine to zero out my red dot laser.

Nice product

Perfect for bore-sighting in and will get you on target for the range to finish the work on paper. Highly recommend

The laser is incredibly close to the same mark no matter which way the tool is oriented in the 9mm bore. Add in the price point makes this purchase a no brainer. Unless you like spending high $'s to make you feel good about your purchase, this is a great buy. Highly recommend.

Works reasonably well for what it is. You do need a cleaning rod to push it back out of the bore and it doesn’t have a power switch so you’ll be taking the batteries out of it when you’re done. However, it’s a quick way to get your sights/red dot onto paper before you go to the range. Especially important with current pricing.

Edit: Updating to a 1 star. Didnt last an hour with batteries that came with it. Ok no big deal. Bought name brand batteries to replace it. they went out in 20 minutes. Put in another new set they went out within seconds. The batteries are good. Tested with a voltage meter. The electronics must be faulty. I can explain it any other way. Beware. Other lasers will have a quick method to turn the laser off, either a button switch or you can unscrew the cap slightly. This laser cap needs to be COMPLETELY removed and all the batteries removed. even with 2 batteries in it, there is enough voltage to fire. Not a dealbreaker but its two extra steps EVERY time you want to use it. Put batteries in. Take batteries out. Secondly, the beam is a line not a dot. While diode laser technology does actually form a line vs a dot, most lasers will have a lens that focuses the diode light down into a point. This one you can see the line even at a distance of an inch or two. I needed this to show a dot over a few feet and it is hard to find that exact center. For sighting a gun it might work, but not for my alignment application. I bought it for the small form factor to fit in a bore. I'm out 12 dollars, no big deal