Rifle Scopes 3 MOA or 6 MOA red dot for AR pistol?

The 6 MOA dot is twice as large in diameter as the 3 MOA dot. Which is better for you will depend on you intended use and the type of sight selected.
 
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Shooting close and fast get the 6, if you need to be a bit more precise then the 3. The 3 will be twice as difficult to acquire quickly, the 6 will be twice as hard to aim small with at distance.

Since this is a 300 I don’t think you can go wrong with either, if this was a handgun I would say go 6. If you’re running a brace go 3.