9MM/ .243 .308/6.5MM/300BLK 7.62x35mm/.44mag/30-06/25-06/270 Cal Rem Gauge Bore Sight Red Dot Boresighter with Batteries

Works perfectly in My Palmetto State Armory Saber AR-10 chambered in .308. I have no issues with this going in or coming out of the chamber. When my bolt is closed their is no indication that it is moving inside the chamber. I can't weight to get this out to 25 yards and zero my scope with it. The only way to turn it off is to pull out the batteries. I will have to get these in 7.62X39 and 5.56 depending on how well it gets me sited in. At 12 bucks that's cheaper than 10 rounds of 308.

This really helped me set the leaser dot at 15 yards for the 9Mm firearm, zero in perfectly without a smith help, all you need is a small target and Allen rench

This bore sight works amazingly well. I used it to zero my red dot sight on a 9mm pistol, and it made the whole process fast and precise. The laser is bright and easy to see even in decent lighting, and having three sets of batteries included is a great bonus—no need to worry about it dying halfway through setup. It fits snug in the barrel and doesn’t wobble, so alignment stays consistent. For the price, the quality is impressive. If you’re looking to save time and ammo when zeroing in optics, this is a must-have in your range bag. Highly recommend!

The laser device itself worked great, was able to align my red dot quickly. To turn off the laser you need to remove the batteries. You get 3 sets of batteries included. Make them count, they are one use only. After the first use, which lasted no more than 5 minutes I removed the batteries from the laser, The second use 2 hours later the batteries were dead, so I used another set. Checked an hour later and those battery's were also kuput.

easiest and best way to sign in a laser dot

Well I have to say this is a great tool. Unfortunately the first one was no good and the laser was way off. The replacement was spot on accurate. Don’t forget to use the red dots on the back cap so the batteries don’t burn out as there is no shut off point. You can just do what I do and take the batteries out and put everything back in the box it came in. Overall I think this is a super too and you don’t waste time and money on rounds. You can accurately site a rifle in with 3 shots 4 at most.

Great product

I've come to realize that Amazon front loads all of the 5 star reviews and keeps the poor reviews further to the back. Anyways, I did not realize that a company could screw up a bore sighting laser but this one actually did. I bought this thing because it was cheaper than the others. There is a reason that it is cheaper: It is a poorly made piece of dog doo. The package says that it comes with batteries and it doesn't. Then, once you buy batteries for it and slap them in there, the laser barely works or works intermittently. This is junk guys. Do Not Buy.