What MOA dot size should you buy?
Quick answer: dot size buys you speed or precision, and you cannot have both in one dot. A 6 MOA dot covers about six inches at 100 yards, grabs your eye instantly and suits a carry pistol. A 2 MOA dot covers about two inches, obscures far less of a distant target and suits an AR-15 or target work. 3 to 4 MOA splits the difference. A bigger dot is not less accurate, it just hides more of what you are shooting at.
This is the one red dot spec people get stuck on, and it is written a dozen ways: 3 MOA vs 6 MOA, 2 MOA vs 6 MOA, "what dot size for a Glock". They are all the same question, and the answer is a single trade you can settle in about a minute once you know what the number actually measures.
What the number measures
MOA means minute of angle, and one MOA is about one inch at 100 yards. So the MOA figure on a red dot is simply how much of your target the dot blankets at 100 yards: a 2 MOA dot covers roughly two inches, a 6 MOA dot roughly six. Because it is an angle, it scales with distance, and this is the part that settles most arguments: that same 6 MOA dot covers only about 1.5 inches at 25 yards. If every shot you take is inside conversational distance, a "huge" 6 MOA dot is not huge at all. If you shoot at 100 yards, it is covering a dinner plate. The full unit explanation is in our MOA vs MRAD guide.
The sizes, and what each is for
| Dot size | Covers at 100 yd | Best for | Our example |
|---|---|---|---|
| 2 MOA | about 2 in | Precision: AR-15, target pistol, shooting past 50 yards | Holosun HS407C-X2 |
| 3 to 3.25 MOA | about 3 in | The all-rounder: fast enough close, still usable at distance | Trijicon RMR Type 2 RM01 |
| 4 MOA | about 4 in | Rifle and range work where speed matters more than a fine hold | Vortex StrikeFire II |
| 6 MOA | about 6 in | Speed: carry and defensive pistols, close-range work | Holosun HS407K-X2 |
| Selectable | varies | You refuse to choose, or the gun does two jobs | Vortex Defender-CCW (3 or 6 MOA) |
| Circle-dot | 2 in dot in a 32 or 65 in ring | A fast ring for close work plus a precise dot for distance | Holosun HS507C-X2, HS510C |
3 MOA vs 6 MOA: the one people actually ask
This is the real decision on a pistol, because it is the gap between the two most common carry dot sizes. The 6 MOA dot is twice the size of the 3 MOA, and that bulk is the point: under stress, with an imperfect presentation, a bigger dot appears in the window sooner and your eye locks onto it faster. The 3 MOA asks for a slightly better index but leaves you able to shoot a small target at 50 yards without the dot swallowing it.
Choose by honest distance. If your pistol is for close defensive work, take the 6 MOA and do not feel you have compromised. If you shoot steel or paper past 25 yards, or the same gun does both jobs, 3 MOA is the safer all-rounder. Our best pistol red dot picks cover both.
2 MOA vs 6 MOA: the two extremes
Put the ends side by side and the trade stops being subtle: three times the dot. The 2 MOA is the rifle and precision answer, and it is why our AR-focused picks lean that way, a dot that lets you use the 100-yard capability the gun already has. The 6 MOA is the carry answer, built for a sight picture you find without thinking. Almost nobody should agonise here: the gun and the distance decide it for you.
The interesting middle ground is refusing the choice. A selectable sight like the Vortex Defender-CCW gives you 3 or 6 MOA from one optic, and a circle-dot like the Holosun HS507C-X2 puts a precise 2 MOA dot inside a fast 32 MOA ring, so the ring finds the window for you and the dot does the aiming. The HS510C takes that further with a 65 MOA circle, which on a shotgun roughly mirrors a buckshot pattern.
Two things dot size does not fix
- Astigmatism. A bigger dot usually just means a bigger smear. If a dot flares for you, a circle-dot reticle often reads more cleanly than any single dot, because the ring gives your eye a shape to centre. It varies by eye. See best red dot for astigmatism.
- Accuracy. The optic is not less accurate with a big dot. Your ability to aim precisely at distance is what changes. Blaming a 6 MOA dot for a 100-yard miss is blaming the wrong thing; you chose a speed tool for a precision job.
FAQ
What is the difference between 3 MOA vs 6 MOA?
Size, and what that costs you at each end. A 3 MOA dot covers about 3 inches at 100 yards and a 6 MOA dot about 6 inches, so the 6 MOA is roughly twice the dot. The 6 MOA is faster to find under stress and forgiving of a sloppy presentation, which is why it is popular on carry pistols. The 3 MOA obscures less of a distant target, so it is the better choice if you shoot past 25 yards with any precision. Neither is more accurate: the sight does not become less capable, your aiming point just gets coarser.
What is the difference between 2 MOA vs 6 MOA?
These are the two ends of the range, and the trade is at its clearest here. A 2 MOA dot covers about 2 inches at 100 yards and lets you shoot a red dot with real precision, which is why it is the common choice for an AR-15 or a target pistol. A 6 MOA dot covers about 6 inches and is built for speed at close range: it grabs the eye instantly on the draw. If you mostly shoot inside 25 yards and want the fastest sight picture, 6 MOA. If you want one dot that still works at distance, 2 MOA.
Is a bigger MOA dot less accurate?
No. The sight is not less accurate; the dot just covers more of the target, so it is harder for YOU to aim precisely at distance. A 6 MOA dot blankets about 6 inches at 100 yards, so you cannot see exactly where inside that circle you are aiming. Inside 15 or 20 yards it covers only an inch or two and costs you nothing practical, which is why defensive shooters happily run one. The dot size limits your precision, not the optic's.
What MOA dot size is best for a pistol?
For a defensive or carry pistol most shooters are well served by 6 MOA, because speed of acquisition matters more than a precise hold at conversational distance. For a target or competition pistol, 2 to 3 MOA gives you a finer aiming point. Some sights let you avoid the choice: the Vortex Defender-CCW offers a selectable 3 or 6 MOA dot, and the Holosun HS507C-X2 gives you a 2 MOA dot inside a 32 MOA circle.
Does a bigger dot help with astigmatism?
Not reliably. Astigmatism smears or flares a red dot regardless of its MOA size, and a bigger dot often just means a bigger smear. What some shooters find genuinely easier is a circle or circle-dot reticle, where the ring gives your eye a shape to centre even when the dot itself looks messy. It varies by eye, so treat it as worth trying rather than guaranteed. Our best red dot for astigmatism guide covers what actually helps.
Next: best red dot sights · best pistol red dot · MOA vs MRAD · red dot vs holographic · how to sight in a red dot.