Reviews & Ratings for Holosun HS503BU Micro Red Dot Sight — 35 reviews — Page 1

Loved this sight for the longest time. Worked well on my psa ar47 up untill just now. Pulled it out for a gear check and found that the center dot only works on the top 3 of ten settings. Being that those can be sometimes too bright even during the day, i had to retire this optic. I know its chinese but i still expect my equipment to last if im not beating on it.

☆1☆
The front lens comes angled/canted/tilted at the specific angle needed to refract & project back red light emitted from the L.E.D. to your eye. The front lens is engineered to sit at that angle and it works incredibly well. You just don't notice it on some other micro red sights because because they're angled/canted/tilted their front lenses top back. All Micro RDSs front lenses are tilted on purpose, one way or another. ☆2☆
Anywho, I have 2 of these and they're 2 of the best sights that I have and absolutely top tier performance at a budget price (guess who makes the ROMEO 05?�)! I have have been putting them through their paces on 9mm semi-auto Submachineguns & rifles chambered in 5.56, 300blk & 6.5mmG. Never had a problem or malfunction. The "SHAKE AWAKE" (MOTAC), motion activation & auto shutoff work flawlessly and it will definitely come on when you need it to be. I trust my life with this optic for home defense. The glass is very clear & the coating is top notch. The reticle settings are perfect. The reticle is super clean & crisp and more than bright enough for sunny Arizona desert days. The forged aluminum housing is definitely tough and the risers/mounts are tough too. I run one with a Daniel Defense 1/3 cowitness riser mount that is obviously built like a tank and the other one with the stock mount. They have both seen the same abuse and the stock mount has kept up for OVER 3 YEAR...
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Usually I have a good experience with Holosun, but not today. Opened the box and low and behold, the front lens looked like it had been either pushed in, or manufactured that way. Pretty bad quality control. I will not be buying another one of this model.

Time will tell how this red dot holds up, but from what I've gathered these are well made. When it comes to simplicity, size, function and form this red dot is hard to beat for the price. Even if this were a $400 red dot, it would still be a viable option. Optic clarity and the crispness of the dot is perfect. The Circle dot option is brilliant, I love the option of being able to switch between the two.

Three things I would like to see done differently personally, but don't reflect my overall happiness with the product.
-Holosun logo is bright, would like to see a darker paint used.
-I wish the windage and elevation adjustments were printed on the turrets themselves, although having it printed on the caps works well enough.
-I would greatly prefer if the brightness setting were on the left side of the red dot. This would allow the user to adjust the brightness easier. Holding the rifle with a magwell grip, you could use your thumb to adjust the brightness without breaking form.

Front glass was pushed in and unit did not turn on. I have read several reviews of the same problem. I will be reordering and hopefully the next one does not have the same issue. My buddy has one and enjoys training with it, as the reticle is very clear.

I just got my HS503BU for use on my Kel-Tec KSG. I actually got it to replace my HS503C, which is basically the same optic but with different features. Switching from the C to the BU on my home defense shotgun because the auto-adjusted brightness of the C changes the brightness based on the ambient lighting directly above you, which often makes it too dim when looking into bright areas, or too bright when looking into dark areas. Also having to manually switch it on is a drawback when you need to react quickly. The BU solves those issues for me.

As stated in the title, the battery life stated on both Optic Planet's and HoloSun's websites is "up to 50,000 hours," and the box states "50,000 hours with the Dot/20,000 hours with the Circle Dot." However the manual of the optic states that "due to use of new LED technology, the optic can be operated for up to 10,000 hours." It doesn't specify any difference based on which reticle you use. On a home defense gun that will likely be sitting still most of the time, that's not so big a deal, but it will probably be on most of the time while you're moving around with it, or while it's in your car. The super-long battery life was a pretty big selling point, and now I find out it might be up to 5x shorter than advertised. Kind of a bummer.

Besides that, the build quality is excellent, it feels sturdy, the shake-awake feature works as advertised, and there are plenty of brightness levels to find exactly what you need. When it activates a...
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So far so good with the Holosun. Currently have the Holosun HS503BU mounted on my scorpion evo. Holding its zero nicely. Looks good and functions even better. My favorite part is that when you leave the gun alone it will turn off but as soon as you grab it the sight turns back on. I was hesitant at first but I would buy another one for a different gun.

Are you going to battle ISIS in the Middle East? If the answer is "no" buy this red dot.... $157 bucks and free shipping... plus better features (shake awake, battery life) than EOTECH... HOLOSUN iis the leader here... and by the way the reticle looks the same when your on target... Save your cash! Spend the $300 you saved and go buy ammo and practice, practice, practice shooting... (the more expensive red dots won't make you a better shooter fyi).... the 503BU works just as well and your wife gets 1/2 as mad when you buy it. I use it for monthly competitions... I noticed lots of other guys have the same red dot and I haven't heard one complaint about the HOLOSUN... with a lifetime warranty this is a no brainer... and when you finally get deployed you'll be happy you had the extra cash for all that practice ammo... HOLOSUN BIG THUMBS UP!!!

Bought this on a great sale by optics Planet. Just mounted it it in an ADM qd mount and put 100 rds down range. BTW if you do buy the ADM 1/3rd co-witness mount it won't actually co-witness because the battery being in the base of the optic makes the base slightly taller than a T1. I don't care about co-witness however so I like the ADM qd mount. I love it so far and as long as it holds up that won't change.

This unit came recommended from a highly reputable source. It works as advertised with one notable exception.

The front glass appears to be installed crooked. When you look through it there is a shade of red on the right side of the glass. It is primarily noticeable in low light situations. Not noticeable in bright light.

I called to get an RMA number to return it because I was concerned the glass was not installed properly and would fall out or break during use. When talking to the Customer service rep, I was told that the glass is supposed to be installed that way. Given the fact that this has come up in previous reviews, its possible. If that is the case, Holosun should document that somewhere because I really don't believe it. So here is the deal - if it continues to work and the glass doesn't fall out, then its worth the $160 bucks I paid for it. I won't buy another one. If it breaks, I will throw it away and get something else.