Please, let us know if the absolute co-witness mount fixes the problem.
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Please, let us know if the absolute co-witness mount fixes the problem.
How would changing the mount height of the optic fix the parallax issue in the optic itself?
I believe the optic does have a parallax issue. My problem is that my inability to see a definite red dot prevents zeroing. I have to use the rear aperture back up sight to make an actual usable dot. I have basically zeroed the sight in the lower 1/3 of the optic. Use the optic without the back up sight with the now fuzzy dot in the center of the optic? 6" shift in group size to the 2 O'Clock position....
I hope that the absolute cowitness mount will allow me to zero the optic and that my children don't have an astigmatism.
Why not just teach your kids to zero the rifle with the current setup?
Sell it and get an Eotech with the least amount of parallax compare to any other red dot sights.
I'd like to confirm that the OP's MRO exhibits a 6" shift from dot centered in the optic to being located in the lower 1/3 of the optic. Trijicon clearly states on their website, "Like all reflex-style optics, the Trijicon MRO is parallax-free when the dot and target are reasonably well centered in the optic's field-of-view, but when the reticle and target are substantially off-axis, there will be some parallax. The off-axis parallax performance of the MRO meets or exceeds that of other reflex sights of similar size.".
A six inch shift seems like a lot more than "some" parallax. I'm going to be zeroing an LPVO on Sunday, so I can take an MRO along to see if I'm able to duplicate your findings.
My MRO mount is Absolute, but I've been running lower 1/3s for 8 years, so I should be able to approximate where the dot would be.
Other stuff came up today, but hope to make it to the outdoor range next weekend, if I don't take a day off during this week.
Sorry about the late updates. Had a family medical emergency that is slowly getting better.
But before people ended up in the hospital, I put a geissele absolute co witness on the 6720. The result was parallax shift was reduced enough while visualizing the dot through the rear aperture that I was able to finally zero the rifle. I am still not happy about the MRO. It fails to be the aimpoint that I should have duplicated. For now, my daughter likes it, so it remains.