SightmarkPistol Boresight with Red Laser

I recommend using a vise to hold the gun firmly in place for the entire zeroing, so that the "point of impact" revealed by the boresight - marked on a target paper in ink - can remain fixed, the battery can be removed, and the point of the adjustable gunsight can be adjusted (whether red dot or laser sight or barrel gunsight) to coincide with where the boresight was set.It fit perfectly the 38 special it was bought for. I thought it might also fit 9 mm, and even 380 cal - it does not. Strangely, the rim is undersized - the ejector of the revolver cylinder does not catch it to eject it - but I don't hold that against the company; the item works as advertised on what it was designed for.The laser was centered perfectly - straight down the center of the bore - for the 50' distance to the target I wanted: rotations of the boresight within the revolver cylinder produced no visible "circling" on the target.Battery life is not advertised to be long - I think it was to be <1hr of actual "laser on" time - so don't waste time. Take out the batteries when you've learned what adjustments need to be made, replace them only when you are ready to actually verify, then remove them again. It's all easy enough.

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...

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.

It simple works and does a great job allowing me to set up my optics.

strumento molto utile per azzerare la tua 9mm tempo impiegato 2 minuti. molto facile.

Exactly what I needed!

Le laser n’est pas apparent à 20 mètres.

Tut gut was es soll, ordentliche Präzision