HONYAO Bore Sight Red Dot Laser Boresighter .223/ .300 Win/8mm/ .7.62 X 39mm Laser Boresight with 6 Batteries

After reading reviews on the various cartridge lasers, I decided to take a chance on this one. It works perfect. Three tiny batteries go into the base of the cartridge and screw it tight to turn it on. It produces a bright, small red laser point on the wall from across the room. Since mine is a 9mm cartridge, I rolled it along the table and the laser tracked in a straight line. If the laser had been off-center, it would have displayed a speed-bump pattern along the wall. (This test won't work with revolver style cartridges with a protruding rim unless you hang the rim off the side of a flat surface such as a table or a book laying flat.)I tried it out on three handguns. On my first handgun I dropped it into the chamber and lowered the slide, but the slide didn't want to close all the way (go into battery). Despite a previous reviewer's warning not to slam the slide home, I slingshoted the slide and it close all the way using the energy of the recoil spring. The laser lined up perfectly (with my iron sights) from across the room. I was able to eject the laser without a problem. On the second handgun I had the same issue -- the slide wouldn't close all the way until I let the recoil spring drive it home. Perfect alignment again. My third handgun has a known sight problem -- I purchased it used and the front sight is drifted all the way to the left. The laser confirmed I need to drift it back to the center of the dovetail slot. (This handgun also did not want to go into battery unless I let the recoil spring do it's job)None of the handguns had any problems ejecting the laser cartridge. Safety warning: Be careful when ejecting, you'll have a red laser flying around the room, so don't blind yourself (or others in the room).Somewhere on Amazon I read a review of a bore sight laser cartridge where the author claimed that letting the spring slam the slide into the laser cartridge damaged his gun and broke the extractor lever. (It might not have been this particular bore sight laser) If I had never read that review, I'd have let the recoil spring close the slide every time and this would have been a non-issue.Because of all the bad reviews on cartridge bore sight lasers, I was about to buy one of those external bore lasers with a long tail that reaches into the barrel. These are the ones where you attach the proper size spacers to hold it in the middle of the barrel. Fortunately one reviewer pointed out that this external style will not work on shorter barreled handguns. The tail is just too long and the laser won't be supported in the center of the barrel.I'm glad I chose to purchase this 9mm cartridge bore sight. It works perfectly and appears to be accurate.Final helpful hint: Remove the batteries when you store the laser so they're not dead the next time you need it.

The bore site works fine in my striker fired pistols. It did however get jammed in the barrel preventing my RO Compact 9mm from fully going into battery. When this happened it was very difficult to knock loose and rack the slide back to get at the bore sight. Even after I got the slide racked, the bore sight was stuck in the barrel. I had to use a cleaning rod to from the other end and hammer on it to knock the bore sight out.

I ordered the 9MM bore sight to help zero a red dot on a pistol and AR9. The bore sight would not fit all the way into the chamber on any of my pistols. Returning item for a refund.

I'm not sure what other folks are doing with this thing that's causing all the issues with fitment, but in my Canik TP9 Elite SC?Works great.1. Gently unscrew the back, place the first two batteries inside, place the last in the unscrewed back cap, then (again, gently) screw it back on. Boom. Light.2. I just popped it into an empty mag, threw it in, and racked. "Round" entered the chamber with zero difficulty and produced a laser light out of the barrel.3. Lined up my irons first and it appeared to be pretty much dead on- but after adjusting the red dot to match, it seems to be very slightly off.4. Finished up. Threw the slide back and the "round" ejected with no problem.This boresighter isn't here to give you a PERFECTLY CALIBRATED sight set up. It's to get you set up in a good position to jump off of for proper zeroing in at a range.If you don't actually go shoot, but just use this? Will it let you nail things from like 6 feet away? Of course. Hard to miss from that range. But if you're planning to be shooting stuff that's 25 yards out? Maybe take the time to actually put some rounds in.

Not accurate at all chambered it several times to make sure it stays in the same spot constantly and each time it was in a different position compared to my laser that I was trying to get sighted in. I guess ill just have to go to the range and manually sight it in. Groupings was with in 2-3 inches of my mounted laser horizontally each time I chamberd it from 15ft. Will definitely not recommend to anybody, if you want to get your attachments sighted in your better off going to the range.

Would not fit all the way in to the barrel. Unable to use in my Glook 43.

You can't set the red dot if the laser isn't rigid. The bolt won't close allowing the laser to wiggle.This is not good enough for me. I bought this to set my Sig Sauer Romeo zero.I went to the range and used up the ammo instead. Which isn't a total wash.Range time is fun time. THERAPY!When they make a laser that will allow the bolt to close, it will be useful.Until then, NOT!

I can reach into my rifle (7.62x39) with my pinky and jiggle the end of the laser housing so that it changes where the laser light dot is hitting the target. At 25 yards it’s not too much of an issue, but it is still noticeable. Just letting you know what you could be in for.The laser will dim and then turn off after 5-10 minutes of use. I thought the batteries were dead, but when I loosened the battery cap and then screwed it back on, the laser worked again. This happened multiple times, even when switching out the batteries (there are 2 sets of batteries in the package). So the issue here is that I had to work quickly with getting sighted in, because then there is the hassle of removing the laser from the rifle, getting the laser working again, and then re-installing the laser. I don’t know if it’s a problem of the laser overheating or what, because the batteries seem OK?