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For me 2 moa is fine. Circle dot with center dot being as fine as possible is even better. Some of the Lpvo and multi reticle red dots have 1 moa or near 1 moa reticles, fe
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Some of the Chinese multi reticle red dots are 1 moa in the center. I have 6 of these and they are very accurate but newest models are all crap, old models were excellent. They must have changed the manufacturer:
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I saw this one on Amazon but don't know anything about it:
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It's for a rifle as a top mounted on a scope Acogs come with a RM09 for a reason. I can say 3moa is pretty large. I'm probably going to just settle with a holosun dot circle which is 2 moa

As for a just on a pistol 3 moa isn't terrible. You can hit a 8 inch steel with that at 100 yards with practice
 
It's for a rifle as a top mounted on a scope Acogs come with a RM09 for a reason. I can say 3moa is pretty large. I'm probably going to just settle with a holosun dot circle which is 2 moa

As for a just on a pistol 3 moa isn't terrible. You can hit a 8 inch steel with that at 100 yards with practice
I have a few pistol red dots on top of rifles. 2 MOA is about the best I can find without getting into the $500+ range. It works just fine especially as a piggyback option. Those really are for close range only, as anything at any kind of distance at all will be through the optic. Honestly you don't actually need a piggyback red dot for extremely close ranges, you can sight over the top of the optic itself if you just practice the sight picture or even just point-shooting with a longarm.

I actually think they are kinda pointless unless your optic does not have any kind of low magnification (say 3x or lower) as those can be used down to 10-15 yards adequately well. The red dots really only shine in that weird longish-short range space, say 5-20 yards. That is far enough out that point shooting is not practical, but close enough that a large enough minimum magnification is not conducive to snap shooting with the optic. In that range 2, 3 and even 5 MOA dots work just fine.

But I find it is actually kinda hard to get a setup where you really need a dot to cover that distance, and I have removed my piggyback dots off of everything but my "taticool" 308 setup that has a 4x+ scope. I really only use them as dedicated optics for close range stuff now (PCCs mostly). For that use case the smallest dot possible is nice as it extends the range of the platform, but most of those are "for fun" guns and it is hard to justify the cost of a 1 MOA dot given the use case.

Of course YMMV, I have no idea what kind of mark1 eyeballs you are dealing with, so maybe you will find them far more useful even sitting on top of a low magnification optic, or perhaps for competition shooting where any kind of edge is important (and of course combat, where the same principle applies). But I am just not sure how much that stuff applies for the vast majority of more mundane applications.
 
My Aimpoint has a 2 moa dot on it and I have no problem hitting a coyote sized target at 200 yrds.
 
My Aimpoint has a 2 moa dot on it and I have no problem hitting a coyote sized target at 200 yrds.
Oh yeah, they are fine for stuff like that if the cartridge can handle it. But smaller dots are nicer for pushing out. 2 MOA at 200 covers ~4 inches which is a perfectly acceptable margin for coyotes and the like. Might get a little hard blasting cans with that though, so it does depend on use case. I personally prefer something with an etched reticle for anything out past 150 or so, and while I do not find magnification necessary it does make things easy. Red dots struggle with any real precision shooting. Their strength is was more on rapid target acquisition and good enough shots on target. I use one on my primary self defense gun, but not on anything for hunting past 100.

Again, this is all very much based on preferences. I know some people basically cannot use a red dot at all die to eye issues. But this question was about a red dot to live on top of another low power optic, which is a pretty specific use case and I never found it to be all that useful. If you want to reach out to any applicable range at all you will be using the optic, the red dot is only for that close in rapid target acquisition job. That job can use just about any dot size on the market and you will not notice much of a difference.
 
I feel like 2 moa is the standard for a minimalist pistol dot, I didn't even know trijicon made a 1 moa. I wonder if it would be helpful with my astigmatism.
I would say 3.25 moa is pretty standard for a pistol dot, both the Trijicon RMR RM06 and Aimpoint P-2 are 3.25 moa and pretty universally used on defensive handguns. As mentioned the RM09 is 1 moa. I've heard the 6.5 moa is popular with urban LE because they are more difficult to be washed out by busy background lights, such as their own cruiser flashing lights.

Here is what the Trijicon website starts:

1.0 MOA Dot

The 1.0 MOA dot gives the user our smallest dot available in our Adjustable LED models. The fine dot allows for shooting more accurately at greater distances and is a great solution for long-range pistols, rifle, and carbine applications.

3.25 MOA Dot

The 3.25 MOA dot is the most versatile and popular of all RMR dot sizes. The dot is small enough to allow accurate shooting at range while also being big enough to locate quickly.

6.5 MOA Dot

The 6.5 MOA dot gives the user the biggest dot available in Adjustable LED-operated models. The bigger dot size gives the user the ability to locate the dot quickly, which is ideal for close-quarter engagements, and is also a great solution for those with poor vision.
 
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I have a few pistol red dots on top of rifles. 2 MOA is about the best I can find without getting into the $500+ range. It works just fine especially as a piggyback option. Those really are for close range only, as anything at any kind of distance at all will be through the optic. Honestly you don't actually need a piggyback red dot for extremely close ranges, you can sight over the top of the optic itself if you just practice the sight picture or even just point-shooting with a longarm.

I actually think they are kinda pointless unless your optic does not have any kind of low magnification (say 3x or lower) as those can be used down to 10-15 yards adequately well. The red dots really only shine in that weird longish-short range space, say 5-20 yards. That is far enough out that point shooting is not practical, but close enough that a large enough minimum magnification is not conducive to snap shooting with the optic. In that range 2, 3 and even 5 MOA dots work just fine.

But I find it is actually kinda hard to get a setup where you really need a dot to cover that distance, and I have removed my piggyback dots off of everything but my "taticool" 308 setup that has a 4x+ scope. I really only use them as dedicated optics for close range stuff now (PCCs mostly). For that use case the smallest dot possible is nice as it extends the range of the platform, but most of those are "for fun" guns and it is hard to justify the cost of a 1 MOA dot given the use case.
I know plenty of people (including myself) that use a piggyback as their primary optic and only drop down into their LPVO, which is left on the 4x/6x neighborhood, when needed for extended ranges or precision shots on small targets.The taller HOB gives a more natural heads-up POV for better use of peripheral vision/situational awareness and a must for NODS. Personally IMO I think a piggybacked MRDS/LPVO is the ultimate general purpose carbine setup.
 

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