The green dot is larger in diameter than i was expecting and the brightest dot i could imagine. It takes 3 shots to put you on the bullseye.

Holosun 510 is far superior to the cheapo red dot clones. Wide view, great adjustable reticle. X magnifier it is great.

Holosun has very a strict warranty, don't end up with a 300 dollar paperweight like i did. I find this to be completely unacceptable and have already started my return. Its a paperweight at best.

Light coming from where it projects the reticle onto the lens is distracting. Battery life is terrible and the brightness is not that good.

Holosun sights are great sights, but the experience with this seller was horrible. No quality control sticker like reputable manufacturees have from the last one to check it prior to shipping. Beware on fake holosun products.

One unit failed to power on despite a battery swap, the other has a recurring reticle surge from dim to bright. That's just unacceptable for a $340 optic. Buy vortex or eotech instead.