Red Laser BoreSighter Bore Sight Kit for .177 to .50 Caliber Rifle Scope Handgun Red Dot Boresight Kit Set Tools Accessory with Rotary Switch -0.177 0.22 to 0.50 Bore Sight Set

I attempted boresighting for the first time this month, and I learned a few things a newbie NEEDS to know. First, NEVER buy a sight that hasn't been factory-zeroed. The first one I bought was an absolute hell of micro-adjustments with tiny allen-head screws, attempting to clamp my pistol in position, and in the end it turned out to be slightly bent and un-useable. DON'T BUY A BORESIGHT THAT NEEDS HOME-ADJUSTED AND ISN'T FACTORY-ZEROED! May you never know the hell of trying to one-man home-zero a boresight laser...This one is, praise Odin, factory-zeroed. You're good buying it. Just be careful as hell with it, because one good hard whack can bend it or knock your laser out of alignment, and then you have a worthless piece of junk on your hands.Also its made in China and, while it functions perfectly well, the translation and instructions left...a lot to be desired, let's just say (They couldn't even spell "Eight" correctly on the front of the box it came in!).The manual it comes with also doesn't really tell you how to use the little plastic bore-fillers, which is damn important! So I will do it for them:The plastic bits (bore fillers?) need a screw run through them, but it doesn't tell you which end, or why. You put the screw in the end with the small screw hole, and out the flanged end. When you then screw it in to the end of the boresight shaft, that split/flanged end gets opened up by the little sloped bit on the tip of the boresight shaft, and that allows you to adjust how snugly the device end fits in the barrel of your gun by tightening or loosening the screw. The tighter the better, as this will make the boresight more accurate (But don't tighten so much you bend the sight trying to get it in or get it stuck in the gun barrel!). Make sure you push the sight shaft all the way into the barrel until the cone holding the batteries and laser prevents you from inserting it any further. This forces the cone to center in the barrel and gives you a straight line down the bore. Clamp the gun in place, turn on the laser, aim it at a wall, and then gently rotate the boresight. If the laser dot on the wall stays in one place, congratulations, your boresight is working! If not, return it because this means the factory didn't zero it properly and it is defective.

Laser is not very powerful, 15 yard use,but it got me sighted in.

Great item. Dose the job well. Thanks

Do not buy this cheaply made China junk.

Does not work. DOA changed batteries everything and I cannot get it to turn on.

The reality is with these bore sighters, unless you spend a lot of money to get something machined to perfection the best they are going to do is get you close. This one came and the laser shot straight and it works good enough so you can at least hit a paper target on your first shot.I paid 17$ for this and it showed up at my door in 3 days, which is a big reason I give it 5 stars.People can argue that the bullet type are better, or it's not 100% perfect, or whatever else. Reality is once you get your weapons sighted in this thing is going to sit on a shelf. For 17 bucks and it works with most any gun to get you a close starting point, it's good enough.