Holosun HS403B vs Romeo 5

Holosun HS403B vs Romeo 5 – Which Is The Better Gun Sight?

It seems there’s an almost endless number of brands and models of red dot sights on the market today. That makes comparing them a real chore.

If you arrived at this article because you’re confused about the differences between the Holosun HS403B vs Romeo 5, you’re in luck! In today’s article, we’ll be comparing the pros, cons, and features of both of these red dots. Let’s get started with a quick comparison chart of the features.

   Holosun HS403B    Romeo 5
  Reticle    2 MOA  2 MOA
  Eye relief    Unlimited  Unlimited
  Parallax    Parallax free  Parallax free
  Magnification    1 x  1 x
  Reticle color    Red  Red
  Housing material    6061 T6 Aluminum  Aircraft-grade aluminum
  Battery life    50,000 hours  40,000 hours or more
  Battery type    CR2032  CR2032
  Mounting    Picatinny  Picatinny / weaver
  Weight    4.3 oz.  5.1 oz.
  Dimensions    6 x 6 x 4 inches.  3.15 x 4.72 x 3.54 inches.
Made In USA?ChinaUSA
   Check Price On Amazon Check Price On Amazon

Key differences between Holosun HS403B vs Romeo 5

While feature-wise, a lot is the same about these red dots, there are also a few differences here. For starters, the Romeo 5 is much more compact than the HS403B, though it is slightly heavier.

While the HS403B has superior battery life, it has inferior aluminum when compared to the Romeo 5. The Romeo 5 can also be mounted on a wider variety of guns thanks to the addition of the weaver rail.

However, Holosun gun sights are made in China, and Sig Sauer products are manufactured in the United States. So, if this is important to you, you’ll likely want to go for the Romeo 5 to support domestic manufacturing.

BUT, that’s just specs. We also need to look at how these red dots perform in the real world. So, keep reading to get our review and see what other consumers had to say about both of them before you decide.

Holosun HS403B review

HS403B is a 20mm micro-optical red dot sight manufactured by Holosun. The sight is specially designed for carbine and rifle applications, and it uses a CR2032 battery which lasts for around 50,000 hours.

Moreover, the sight features shake awake technology – which allows the device to shut off when not in use and to turn on with the slightest movement, making it ready for action at a moment’s notice.

The multi-coated lens of Holosun 403B facilitates in providing the users with maximum light transmission. Moreover, the coatings keep the quality of the lens intact and also reduce the glare. Holosun’s superior LED offers versatile options of intensity no matter the brightness level of your environment.

Most buyers love the affordable price of the sight and the perfect optics of Holosun. Moreover, customers always praise the shake awake technology. However, Holosun gun sights are made in China – and the Romeo 5 is made in the USA. Click here to read additional reviews and check prices on Amazon for this red dot sight.


  • 50,000 hours of battery life.
  • Sharp and clear lens.
  • 2 MOA dot reticle.
  • Picatinny mounting.
  • Housing made out of 6061 T6 Aluminum.
  • Water, fog, and dustproof.
  • Parallax free.
  • Lighter than the Romeo 5.
  • Unlimited eye relief.
  • Matte black finishing.


  • It costs a little more than Romeo 5. 
  • Its size is bigger than the Romeo 5.
  • Not made in USA

Sig Sauer Romeo 5 Review

Sig Sauer’s Romeo 5 is also a 20mm micro-optical red dot sight. The sight features ten different illumination settings – 8 daylight and 2 night vision, to ensure visibility in all kinds of light conditions.

This sight’s MOTAC technology allows the sight to turn on when there is any movement and turns off when there is no motion for a certain time period. The sight is completely water and fog proof, so the users can easily use it in any weather conditions.

Buyers always love how easy it is to adjust the windage and elevation and the fact that covers on the adjustment knobs can easily be turned over. The crystal clear and sharp lenses are top notch as well.

However, some consumers have complained that the outer lens is reflective when used at a certain angle. Moreover, the sight is not completely parallax-free; it does have a little parallax. Click here to check prices and read additional reviews for the Sig Sauer Romeo 5 on Amazon.


  • It costs less than the Holosun HS403B.
  • Made in USA
  • Eight daylight and 2 night vision illumination settings.
  • MOTAC technology is the same as the shake awake technology in the Holosun HS403B.
  • Weatherproof lens.
  • Housing is made out of aircraft-grade aluminum.
  • Picatinny and Weaver mounting.
  • Unlimited eye relief.
  • Matte black finishing.
  • 2 MOA dot reticle.
  • Smaller in size than the HS403B.


  • Heavier than Holosun HS403B.
  • It is not completely parallax-free.
  • The lens might be reflective at a certain angle.
  • Lesser battery life – 40,000 hours.

This one was a tough call, but we’re going to go with the Holosun 403B. Despite it being slightly more expensive, the fact that consumers expressed concerns that the Romeo 5 is not completely parallax-free can’t be ignored.

While the Romeo 5 is a good gun sight, the Holosun 403B seems to have better quality and features. Though in the end, this is a decision you have to make for yourself.