SightmarkPistol Boresight with Red Laser

I bought the 9mm version. I used it to adjust the iron and red dot sights on a 9mm carbine at 25 yards. The laser is only so bright, so you're either going to have to do this indoors, or outdoors on a less then bright sunny day. My unit came with 2 AG5 batteries. It will also accept 3 AG3 batteries. There is no on/off switch, when the batteries are in, the unit is on. I suggest you take them out when you're done. I had mine running for about 45 minutes on the batteries that it came with without noticing any change in the lasers brightness. After sighting in the iron sights at 25 yards, I experimented by rotating the boresight in the bore 90 degrees at a time to see if the laser was still aligned with my sights. I noticed no difference at that distance. My red dot is mounted on an American Defense quick detach mount. It was interesting and educational to use the laser to sight in the red dot. After my initial sighting in, I used my hand to flex and twist the sight on it's mount while it was attached to the rail of my gun. Guess what? It was clear I needed to tighten my mount! Then I used the laser to see just how well the red dot would hold zero when repeatedly removed and replaced on the weapon. Again, at 25 yards, I couldn't tell a difference. Finally, as I had done with the iron sights, I rotated the boresight 90 degrees in the bore, rechecking it each time against the red dot sight. Everything looked good! After all that, I switched to live ammo to check my efforts. I was off about half an inch high to the right. Fantastic results as far as I'm concerned! I'll sort out the rest at the range. I consider what I paid for this device money well spent for what I've used it for so far. Mine was a tad tight in the bore, even after cleaning the bore carefully and applying a VERY light coat of oil, I still had to use a pair of needle nose pliers to carefully extract it each time I removed it. I don't consider this an issue, just passing along my experience.EDIT: April 10, 2016 - Just a quick note on batteries, The second time I took this thing out to use it, the original AG5 batteries it came with were dead. The laser came on when I put them in but before I could use it, it sputtered out. I had bought a package of 10 Maxell AG3 batteries at the same time I ordered this boresight so I put in 3 of them. They lasted 10 minutes at best! I don't know exactly what to make of this information. Are two AG5s inherently better then three AG3s? Are the Maxells I bought just old or crappy? This much I can tell you, you gotta work quick to get anything done in 10 minutes...

Perfect in my two Jay frame revolvers. Lined right up with sighs. Easy work to align crimson trace.

so i ordered one of these from optics planet.. NEVER showed up.. got my refund.. ordered from amazon.. it finally arrives.. and this thing is sighted so far high and right.. you'll never hit ANYTHING using it to sight in your other laser sight.. i bought it to check my sight replacement on my glock and to quickly sight in my viridian x5l gen 2.. lined up w/o hardly any effort at all. wasn't paying much attention to the sights on the gun itself and figured eh.. whatever.. and squeezed off a round.. from 50 feet.. missed the target all together. glanced at the sights themselves.. lined up perfect.. laser is WAY off. decided to drop the boresight back in just to double check things and this time.. paying more attention.. yeah.. that thing is so far off.. there's no way you could hit a thing with it.. ridiculously far off. at 50ft.. we're talking a good 12 inches right and about 4 up. i could do a quick iron sight zero on my viridian and be more accurate than this thing.. its complete garbage and a serious waste of 30-40 bucks. will be contacting sightmark as this is simply unacceptible.addendum to my review. after pestering sightmark (sellmark) for 3 weeks.. a rude and abrupt phone call to their office got me an email address to email directly and almost hung up on. the email i sent finally i guess got the point across as i got an email back with an RMA number. i do believe this is the last time i will be dealing w/ sightmark (sellmark) for any future purchases. next time i need a boresight, i will simply spend the full 100 bucks and actually get one from a company a bit more reputable and worried about their customer service than peddling crap and not looking out for their customers.

I've been tempted to get some sort of laser boresight for a while, and the acquisition of an H&R Handi-Rifle in .357 finally pushed me over the edge. There's a lot to like about this unit- and a few irritating things as well. Let's start with what I like about it.First of all, it's really easy to use. Insert the batteries, slip it into the chamber, point the weapon at a distant target, and align the red dot with the sight or scope. Simple. It took me less than a minute to get my rifle ready for the range. Second, each unit is individually aligned- you can see the alignment screws used to do this. And last, the price is right. For not much more than the cost of a box of ammunition (more or less) you can align your gun so it will at least put those first shots on paper.The bits I don't like:First: The .38/.357 is a rimmed cartridge- but there's no rim on this boresight. In my .38 S&W K-frame, it slid in until it reached the end of the chamber in the revolver, protruding just far enough to pull it out when I wanted to remove it. In the Ruger Blackhawk, it disappeared into the cylinder, as the cylinder is bored more deeply; luckily it slid out easily. But in my H&R rifle, it disappeared into the chamber and wouldn't come out when I tilted the barrel upwards; it had to be removed with a cleaning rod. Putting a rim on the brass piece that screws into the back would have added a negligible amount to the cost of manufacture but would have made it much easier to use. Second: There's no on-off switch, and battery drain is high. Turning it on and off requires the insertion and removal of two extremely small batteries- easy enough to do at home, but at the outdoor range one or more pieces are liable to disappear. A simple switch could have been implemented a number of ways. Last, the fabric case has a pocket to hold the batteries that's open at one end, and doesn't really hold the batteries very securely. A snap-open plastic case would be more secure, and perhaps cheaper to make as well. For now I'm keeping mine in the bubble packaging it arrived in, but I plan on finding a small translucent polypropylene box I can store the boresight and several spare batteries in it.But the positives outweigh the negatives. This is a very useful piece of gear that's easy to use and cheaper than any decent traditional optical boresight. With the shortage of ammunition and reloading components today, it's a good tool for conserving ammunition, too.