.22LR/.177 Cal/ 9mm /.375 Cal / .41 Cal / 40sw/10mm Red Laser Boresighter Bore Sight End Barrel Easy to Fit Revolvers Pistols Rifle and Air Guns with Batteries

Works absolutely perfect zeroed in in my basement and shot at 50 yards and she was right on

This is very nice for getting a general zero on rifles. You will obviously want to zero with a few rounds when you have a chance, but this will keep you from wasting rounds trying to find close to zero. The laser is very bright as well and can be seen easily in the day light. It fits in the end of the barrel or the chamber of your rifle depending on the caliber very easily.

The device is designed to be inserted into the muzzle of the barrel in such a way that it provides a secure connection that is perpendicular to the axis of the bore. The design is both small and lightweight, adding to the ease of the product by making it simple to use and maneuver with a variety of different kinds of firearms. After being fitted, the bore sight will offer a reference point that is both extremely visible and accurate thanks to the red laser that it emits. This laser beam makes it possible for sights, scopes, or red dot optics to be aligned quickly and accurately, which substantially simplifies the process of zeroing in on a target. I am now able to obtain ideal alignment with ease and confidence, regardless of whether I am practicing on the range or in the privacy of my own garden. This bore sight genuinely impresses me with its wide range of application possibilities. It is suitable for use with a diverse selection of weapons, such as revolvers, pistols, rifles, and air guns, among others. Due to the device's adaptability, I am able to use it throughout the whole of my collection, which frees me from the need to maintain several bore sights. Because of its dependability and versatility, it has become an essential component of my collection of weapons.

I wish they had provided some sort of tool to remove the O rings. I found it very difficult to remove them without ripping them or damaging them. But since I only have to do it once in a while between my .22 and .17 HMR I guess it's bearable. Once I had it fitted it work perfectly.

Very easy to use. I have not tried long rage though. Got for a home defense firearm. Way better than the last one from Walmart.

This laser unit works well, is easy to set up and use. It is a good quality product.

I have the same issue with this one as I did with the 1st one that I ordered. The part that screws into the laser the treads are loose and does not work when screwed in. The laser will work with the batteries and without the part that goes into the barrel, once touched with the barrel insert part the laser goes out. Yes, I have the insulator per instructions installed. I thought maybe some how it was grounding itself out, so I even put Teflon tape to act as an insulator. Still no luck. I hate to send this one back too. No choice, but I am going too. I will order a different brand. I have reread the instructions 4 times to make sure there is not something I am not doing correctly to cause it not to work.

This thing is SO far off-- at 10 FEET (yes, 10 >feet<) its off by at least 1 foot left and foot high. I don't know what the mounted inside the laser housing, but its nuts how off this thing is. No way I can use it to dial anything in.** Correction!!Once I used the proper O-Rings to seat the thing, it was spot-on, both on 9mm and 10mm, and it was compared with my Bore-Sight...The issue is that its not "obvious" which O-Ring(s) to use-- and they are a bit fragile. For the 10mm I had to use a "thicker" O-Ring-- it required me to use needle-nose to spead it to get on the device. They include some others (white) which when spread just break in half (And, at least I couldn't get them over the device itself :shrug:)BUT-- for $13 bucks, its not bad-- HOWEVER, for $25 bucks:https://www.amazon.com/dp/B0874FJS7Q?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1Does the job, and I was able to use it on 9mm, 10mm [ ** 5.56(.223) WILL NOT FIT ** ] with ease... It's pretty obvious (to me) which one to choose, unless $12 bucks means that much to you...