Great device for quick sight calibration or for adjusting fixed aiming devices. I move the Vortex Venom EBR-7C scope with the quick Spuhr QDP-4616 mount between four different firearms – all you need to do is attach the magnetic laser and, with just a few quick clicks, you can roughly zero the scope. You don't even need a stand to sight in your rifle – just use a bipod, hold the stock against your shoulder, aim at the target, and you can zero the device. The laser dot is very clear – I have laser boresighters that are outperformed by this device. The laser is universal for all calibers. If it just had a tapered pin that fit perfectly into the barrel, it would be ideal. But even if you don't mount the laser perfectly centered on the barrel, it's not a big deal because you will still need to make adjustments for different ammunition.
