CVLIFE Bore Sight Laser 223 5.56mm/9mm/.243.308/12Gauge/7.62x39mm/.45acp Red Laser Bore Sighter with Batteries

I needed a quick, easy, and budget option to set up iron sights on my first 5.56 AR and this CVLife Bore Sight Laser for 223(5.56) did the job very well. It's still essential to go to a range and dial in a zero at proper distance with live rounds, but this will get you on paper and save range time and ammo. The package includes a laser cartridge in 223(5.56) and six batteries. The cartridge takes 3 stacked batteries at once, and each set of 3 batteries lasts approximately one hour, so 2 hours of total use from included batteries. Function: Simply unscrew the endcap from the cartridge, insert 3 batteries, screw the endcap back on, and your laser is on. Once the laser is functioning, you simply place the cartridge into the receiver and *gently* ease the bolt forward until the cartridge is fully seated. You don't want the bolt slamming the laser cartridge into battery as you would a live round. Your chamber may not fully close, but that's ok as the cartridge simply needs to be held in place by the bolt and centered in the bore. You now have a red laser dot shining out of your barrel to which you can sync your iron sights or red dot. I only have about 20 feet of "targeting" distance in my home, so I was mainly concerned with getting the windage adjusted on my iron sights as accurate elevation would be near impossible at this close range. But now I can go to the range with a little more confidence in my initial accuracy and begin the real work. Verdict: Since you'll need to go to the range anyway, this laser cartridge offers an easy starting point for zeroing your sights at a budget price. Checking the alignment of sights between range visits is also a viable use option, but this functionality would be improved with the addition of an on/off switch as removing and installing the batteries for each use is a little cumbersome. At 20 feet the laser is very bright, but somewhat "fuzzy", so I'm unsure how accurate this would be over longer distances. Overall I am very happy with this as it does the job advertised, just be advised that it is only the beginning of the zeroing process. I expect to use this often.

Yeah, worked well for me and you do have to remove the batteries to turn the laser off, but not a big deal. Have AR 15 5.56 Fit nicely in the chamber and it was spot on at 50 yards

Works as advertised. Great option for the price. Only downside is there is no on/off switch so you have to deal with the tiny batteries every time you want to use the laser. Small complaint for such a helpful tool.

Bore sight work just fine. Saved me time at the range, but the battery life is kind of questionable. Does not last as long as you might think.

Fits the chamber well, light is bright and comes with a 2nd set of batteries.

Exactly what I needed to sight in my differing rifle. Easy to use.

There is no switch. You need to remove the batteries to turn it off. Other than that, it works very well. Not perfect, but it gets you on the target so you can zero in from there.

This tool works well but you better work fast bc battery life will not last long at all.