There are 2 basic types of Laser zero's
Constant offset zeros which run parallel to the bore of the gun
Converging diverging zero which has a POA/POI at whatever distance you zero the laser at.
The zero that I choose to run on my rifles is the converging diverging zero. Here's why.
The zero you run on your firearms optic is a converging diverging zero, one would never think to run a constant offset, that would be pretty dumb, so just like your day optic why not run a similar zero and understand your laser holds just like your optic hold overs and unders.
"But Sam the bullet diverges down and to the left of the gun", that is true but at the distance that it does its well outside the envelope for a NV/Laser engagement. Your zero distance can help mitigate much of that. That's why the 50/200 meter zero is so popular on red dots and why I choose the same thing on a laser, yes I will zero my laser at 200 meters, knowing that as long as I put the dot on the thing and squeeze the thing, inside of about 225 meters that round is going to be combat effective on a man sized target.
Additionally I can verify my zero against my day optic pretty much at anytime before I need to do work. Assuming you are running a high quality optic in a high quality mount, your optic zero shouldnt really shift much outside of the normal external ballistic stuff like temp and wind etc.
The constant offset works well for crew served belt fed weapons but is so misunderstood by the laymen/average soldier that its not something I recommend for a rifle. YMMV.
Use whatever zero you want but understand its pro's and cons.
Todd Dunn
2021-08-17 18:21:26 +0000 UTC