They are bloody useless. I've always eyeball bore sighted and can get on to the target at 100yds with first shot. Although @No good names left has nailed the issue with them. If you have one, roll it along a flat surface and watch the large circle it draws on a wall.
To bore sight I use an insulator on the power pole in the neighbours paddock, about 100 metres away, as the target to bore sight. I then add a few clicks of elevation and I'm good to go at 100yds.
However, I do own a laser but the only reason I bought it was to speed up setting up my optical chrony, when I had one.
Otherwise I'm pretty adverse to putting anything in the muzzle.
I nearly had a disaster once when setting up my chrony, I forgot to remove the laser. A the last minute I realised the laser was still in the muzzle. And by last minute I mean I was behind the rifle ready to chamber a round. After that I developed a practice of removing the laser from its plastic box and then sitting the bolt on top of the box in the laser's place.
I've also got a Leupold collimator. Long since discontinued by Leupold. I wonder why. It attaches to the muzzle magnetically. It give a different result from rifle to rifle so not reliable either. And no, my muzzles are not on thepiss.
I alway chuckle to myself if I'm in a gunshop and a staff memebr is setting up a scope for a customer using a laser. Few boxes of ammo probably sold at the same time.
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