... Do your lasermax hold zero pretty well
Yes, but I check all my zeros whether thermal or laser before doing anything serious ... which is pretty much anything involving another person (like a team exercise).
, also many reviewers don't like the switches and complain of accidentally turning on and running down batteries, have you had that problem? ...
I don't like the switches a whole lot ... and I got the pressure switches for both, but both of those are dead now so back to using the on board switches. I check them every time I pick up or put down the rifle ... it is automatic, don't even think about it.
And the switches are not water proof, but I clean the contacts with isopropyl whenever I change the batteries.
The main difficulty ... and this is tru-ish of all lasers ... is that it is easier to zero the laser by co-witnessing to a day scope at night with a 14 behind the day sight. That's how I do it when I'm by myself. And I use Night Optics day/night adapter for mounting the PVS-14 to the rear of the day scope.
I used to do it by having the 14 on my head and holding the 14 behind the day scope with my left hand ... but that is tougher ... the day/night adapter makes it a lot easier.
Whether the day scope is zeroed at 50 or 100 doesn't really matter ... but when co-witnessing the ir-laser put the rifle on a tripod and aim the day scope (with the 14 so you can see what you are aiming at) at something far away ... like 800+ yds ... and then co-witness ... that will "infinity zero" the laser to the day optic. Then remember to aim high or low a little as you would with your day optic. This works fine out to 150yds ... which is about my limit for standing unsupported with the laser at night.
If you really want a parallel zero, you need to draw up the appropriate chart and then you can zero in the house and check it outside.
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The way I zero if I have 2 people, is one heads down near the target, the other looks thru the thermal and aims exactly at the target. Then the 2nd person calls back (on the radio if needed) how much adjustment is needed. Then the person on the gun makes the adjustment and repeat this process until done. Then test.
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And the little allen wrench you use to zero the laser max will get lost in the field. Attach an appropriate sized piece of painters tape to the wrench so you can find it on the ground if you drop it (very useful tip from good ole Aaron).