Trijicon MRO thermal drift testing results

[SuperSet]

[mjmagee67]

Should be very useful info for the extreme mall ninja crowd.

[SuperSet]

I've requested the same from AimPoint so if anyone gets one, please post it here.

[dstewart]

All scopes and sights will drift some with temperature, not just EOTech. Some just more than others. Just for comparison to the MRO, EOTech updated their specs + or - 5 MOA -40 to + 122 deg F and a return to zero of + or - 2 MOA. After the fiasco in December I'm willing to bet they are within this spec.

http://www.eotechinc.com/hws-service-and-support/troubleshooting

[baekacaek]

-60 to 160F? That's pretty impressive. Much better compared to EOTechs, but then I guess it's expected, as EOTechs have much more complex components inside.

[ScottsBad]

When this whole issue with EOTech came up it made me wonder how much additional thermal drift could be caused by the receiver/picatinny as it heats and cools. Same with the mount.

If the thermal drift present in the Scope/sight is added to the possible thermal effects acting in the receiver and mount. Seems like there could be significant stacking of drift as the rifle heats and cools.

It would be interesting to know if anyone has looked at this.

[baekacaek]

When this whole issue with EOTech came up it made me wonder how much additional thermal drift could be caused by the receiver/picatinny as it heats and cools. Same with the mount.

If the thermal drift present in the Scope/sight is added to the possible thermal effects acting in the receiver and mount. Seems like there could be significant stacking of drift as the rifle heats and cools.

It would be interesting to know if anyone has looked at this.

Theoretically I think. Or if you get lucky both might cancel each other out

[dstewart]

-60 to 160F? That's pretty impressive. Much better compared to EOTechs, but then I guess it's expected, as EOTechs have much more complex components inside.

A tiny change internally will be magnified in error due to the light path;

[ArmsUnlimited]

Aimpoint hasn't released this data, wonder why?

[SuperSet]

I have asked but have not heard back. Will post here, if I get any info.

[epilepticninja]

Iron sights don't drift? Too soon?

[fritztkatt]

How about traditional mechanical optics with etched reticles? They are obviously subject to thermal expansion/contraction, but to what degree compared to these electro-optical sights?

Iron sights may not have these issues, but if they were perfect, the magnifying optic or red dot would not have been invented. Of course none are perfect...

[dstewart]

Iron sights don't drift? Too soon?

Yes, they do. Just not very much.

[dstewart]

How about traditional mechanical optics with etched reticles? They are obviously subject to thermal expansion/contraction, but to what degree compared to these electro-optical sights?

Iron sights may not have these issues, but if they were perfect, the magnifying optic or red dot would not have been invented. Of course none are perfect...

All materials expand and contract with temperature, especially aluminum. So yes, traditional optics are no exception.

[fritztkatt]

Does anyone have quantitative research on this?

If your traditional optic drifts just as much as a HWS, what's the big deal? Unless false advertising is in play...