Reviews & Ratings for Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight — 470 reviews — Page 1

I don't really know what to say that hasn't been said before. Holosun makes amazing reflex optics. I prefer them to EOTech or the Sig Romeo products. Easy to calibrate, easy to install, and durable. The reticle is very clear, and this version, with the green optic, is very easy to see in any light condition. I highly recommend this optic. This is the fifth Holosun product that I've bought, not because they keep breaking, but because I love them so much.

On 12/31/25, bought this site for my new Ruger 10/22 model 31222 .22 cal rifle which was designed with no iron sites but had a factory installed picatinny rail; hence, gotta get an optic. Showed up from OP in a cardboard shipping box and with no damage or defects.

This optic had quality build, no defects in the optic, great fit and finish, easy mount to the rail (see instruction book to adjust the rail locking mechanism); all functions worked (3 different reticals and brightness); the 2 adjusting buttons gave a good tactile 'silent click'; no defects in the glass. However, since I have astigmatism, the edges of the pinpoint dot are a touch frayed but not enough to distract from use.

As anticipated, the comb on my stock was way too low. So, next purchase was a comb rising kit from Beartooth from Amazon; from that kit I stacked 2 of the kits foam risers (5/8" and 1/2") and that put my line of site to the middle of the optic.

Next, used an Aimshot .22 cal laser in the barrel to get a preliminary zero in the site. Took quite a few clicks on elevation and windage to achieve zero but not a problem for the optic - had a good range of adjustment. Will go to the range and live fire to finish zeroing. Happy Camper.

Perfect fit for gun, optic is clear fast and easy to find, operation is great

This is my second 510C I've purchased, and you can't beat the value of these sights. The integrated quick release is awesome and the durability has been great on my rifles since these get switched between several of my setups with a magnifier. Reticle is crisp and I've never had a problem with function of the 510.

I wanted to get an eotech for home defense, but this has a way bigger window, shake awake, and insane battery life. Doesn’t break the bank, always works, and holds zero.

Long time Holosun user so I have quite the bias. Really like this on my CMMG Banshee 45. Acquisition from target to target is easy and the reticle is great.

This red dot is an OK red dot for something manufactured Communist China... Until US manufacturing can create good glass at a cheap price we have to buy from our adversaries.

This optic is of great quality. I would definitely recommend for anyone to put on any rifle you consider a red dot for.

A simple, easy-to-use and robust optic. It's perfect for anyone not drinking the eotech kool-aid

Good packaging, love the easy attachment clamp, easy to use and adjust brightness, only took three shots out of the box to zero at 75 yard. Shipping was the only negative. Took over two weeks to get???