Blast... couple of comments on the Holosun 507 and 510... both have a solar cell that helps(or fully) powers the emitter in addition to a 2032 cell.. in bright ambient light the solar cell will intensify the dot
... it is possible to set up either with a "shake awake" function that automatically goes off and immediately on...
there are 3 options to the reticle... a circle, dot, and circle + dot
the circle on the 507 is considerably smaller than the 510... on my 507c v2 the dot is 2moa and circle is 32moa
on the 510c the dot is 2moa and the circle is 65moa
the 510 is large, but the large view window makes tracking targets for Steel Challenge much easier for old eyes
If you pistol is large enough, go with larger. Absolutely a better choice if that's an option. If carrying a Micro, won't work. And, the 507K does not have the solar powered option and is therefore smaller than the 507s with that capability, which is why it works so well on the Micros.
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