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I have a couple of them some models have night vision capability. I like the ones that uses regular AA batteries, probably the quickest on target sight, but like all dot scopes they do not have any power magnification unless you use a 3x magnifier behind one. They are my second preferred site after an ACOG but unlike a ACOG some are night vision capable. I don't remember all the difference in models but get one with the button on the side so you can use a 3x magnifier or maybe a night vision scope like a PVS-14 behind it, The models that use the lithium CR123 batteries are shorter and have a greater depth under water rating ( I believe 60 feet vs 30 for the AA models) but AA batteries are cheaper and easier to find. Some will tell you that lithium batteries are better because they have a 20 year storage, lighter and will work much better at lower temperatures, But the AA battery models will also use the 3v AA lithium batteries. Since these are scopes that are used in the military they had to pass very stringent test (one of the first thing I look for is if an item has been accepted by our military ). Unlike other dot scopes the holographic sight when looking through it project a reticle that appears to be floating a few feet in front of the site and if you get mud are dirt on the lens, as long as there is any spot you can see through it will work perfectly well. Probably the only con is that your aimpoint sights have a much longer battery life.

PS: If you buy a AA battery model get some 3v AA lithium batteries to store or use in very cold weather
If you buy a CR123 battery model get some CR123 rechargeable batteries
 

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@ Fuzzee
Quote: Trijicon's can last a decade, which is nice, but than it's done without new tritium or using an alternative source like a glowstick taped on top. All optics can go down for various reasons, which is why you should alway have good irons too.

The Trijicon's tritium in Acog's is only used in extreme darkness, even without the tritium and the light fiber optic on top they would work a regular scope and still have some light gathering ability to make them usable in the same light that iron sights could be used.

@ Alpha-17
Quote: Bit of advise though, get one of the models that has the battery mounted crossways from the rest of the weapon. Those seem to stay on better/last longer.
If you use 1.5 lithium AA batteries they will work just like the side mounted battery using a CR123a battery.

Edit: I just compared the 1.5 volt AA lithium batteries against the CR123a lithium and two 1.5 Volt lithium batteries would give 3v at 3000 mah = 9 whr and a single CR123a would give 3v at 1500 mah = 4.5 whr So the 2 AA lithium should last twice as long and the CR123.
 
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