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I don't get it. Is green for people who live in the desert?
I had an ACOG with a green reticle once and it sucked, because all the foliage outside (you know, where shooting is usually done) is also green.
Red reticle is much easier to pick up IMO.
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Unless it’s an environmental difference, like shooting in the rainforest vs a rainforest, I don’t think there is a ‘best’. Green ACOGs came out right as green lasers became commercially viable and proliferated. I think the green reticles were really only released to piggyback off that hype. I’ve had multiple Trijicon products in all 3 colors, can’t tell much difference, and use them interchangeably. It is all individual preference. Green is the more desirable color though, at as reflected by slightly higher prices on the used market.
The above ignores that their green tritium specifically is rated to be bright longer. That is an objective benefit, though their tritium is also both a minor selling point and illumination source.