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  • Post last modified:January 8, 2024

Holosun EPS VS 509T which is right for you? We purchased both of them and have used them extensively before writing this comparison article.

holosun 509T vs EPS

This content include pictures and videos going over their sight pictures, mounting systems and overall aiming performance.

Holosun EPS VS 509T Comparison

Disclosure: All products have affiliate links for earning commission to support the website when you purchase

Both optics are considered full size enclosed red dot sights and here are their specs:

Holosun EPS

  • Dot color: Red or Green
  • Dot sizes: 2 MOA, 6 MOA or Multi Reticle System
  • Footprint: K Footprint
  • Material: 7075 T6
  • Submersion: IPX8
  • MOA Turret: 1.5 MOA / Click
  • Battery: CR1620 + Solar
  • Weight:1.4 oz
  • Window Size: 0.63X0.91
  • Length: 1.62 in
  • Width: 1.19 in
  • Height: 0.99 in

Holosun 509T

  • Dot color: Red
  • Dot sizes: Multi Reticle System 
  • Footprint: K Footprint
  • Material: Titanium
  • Submersion: IPX67
  • MOA Turret: 1 MOA / Click
  • Battery: CR1632 + Solar
  • Weight:1.72 oz
  • Window Size: 0.66X0.9
  • Length: 1.6 in
  • Width: 1.16 in
  • Height: 1.13 in

Window Size

eps vs 509t window sizes

The Holosun 509T has a bigger window size as far as vertical height goes. The extra 0.03 inch height may not seem much, but it can make a difference when reacquiring the dot before it gets out of the field of view just so slightly when shooting a handgun with some kick.

holosun eps green dot sight

When shooting rounds down range, the window size is big enough to acquire the reticle.

Overall, the Holosun EPS and the Holosun 509T appear to have similar window sizes when compared directly. However, the Holosun 509T stands taller than the EPS unless it's set into a deep optic cut. This height difference can affect how the sight aligns relative to handgun's grip angle.

Mounting Footprint

walther pdp chpws 509t plate

Holosun EPS's footprint differs from Holosun 509T significantly.

The Holosun EPS features the K footprint, which is also known as modified RMSc footprint. Even though it looks like RMSc footprint, but it's not. In the package, Holosun has included a RMR to K footprint adapter to make it work on most RMR footprint or optic mount.

holosun eps rmr adapter
benelli m4 with holosun eps

The Holosun 509T features a proprietary design mounting system. It's a clamp design that grabs onto the rail section with a recoil lug in between.

holosun eps vs eps carry top view

It's a picatinny rail mounting design, which can be difficult to install on some pistols without proper adapter plates.

If you need to shop aftermarket Holosun 509T adapter plates, please check out CHPWS. They have tons of options available.

holosun 509T bottom view mount footprint

When Holosun 509T first came to the market, many pistol slides won't compatible with it. As time goes on, more and more adapter plates are introduced to the market. 

For long gun use, the Holosun 509T came with a RMR adapter plate, which can go on any RMR footprint mount.

FNX 45 tactical holosun 509T

Enclosed Body

holosun 509t covered with melting snow

Both sights are sealed, so no dirt, water, or moisture can enter. They're perfect for outdoor shooting in rain or snow. If you drop one near mud, you can simply wipe it clean easily.

Turret Adjustment

The Holosun EPS has a unique 1.5 MOA per click turret, while the Holosun 509T has a 1 MOA per click turret. For precise zeroing, the Holosun 509T is better.

holosun 509t side view

The Holosun EPS is great for close-up shots, but its 1.5 MOA per click might be too much for tiny adjustments. For this reason, the EPS can be good for CQB gun setups like on a shotgun.

Both sights have protected turrets to prevent accidental bumps. But, you'll need a small flat-head tool to adjust them. A shell casing won't work.

Remember to bring the tool provided by Holosun to the range. Without it, you can't adjust the turrets.


The Holosun EPS has a reticle system much like the Holosun 509T's, but it also provides extra choices such as the 2 MOA or 6 MOA options.

From what I've seen, the 32 MOA ring reticle works great for short distances but isn't the best for precise shooting. I prefer using the single dot reticle in both daylight and nighttime, so the sight picture isn't cluttered.

If you have astigmatism, the Holosun EPS with its 6 MOA option is a good pick. That is, if the Holosun 509T doesn't offer the same feature.

Brightness Adjustment

The Holosun EPS comes with eight brightness settings, making it versatile for day and night use.

You'll find the adjustment knob on the optic's left side, which is handy for right-handers but might be less so for left-handers, placing the controls on the more awkward outer side.

With settings ranging from extremely bright to very dim, you can select the ideal level for any lighting condition.

The Holosun 509T also features this same range of brightness adjustments.

Parallax Shift

holosun 509t pov 32 moa ring reticle

No optic is truly 100.00% parallax free regardless of company's marketing message say. Please watch the video below to see the parallax shift in details:

When looking at the Holosun EPS, parallax is important. When the product is at the far left of the glass, there's no shift at 25 yards. In our tests, there was little shift, giving a clear shot without parallax issues.

When looking at the Holosun 509T, the glass already has some distortion and the sight picture is about 0.3X magnified, which increases the parallax a little bit.

Battery Life

Both Holosun EPS and 509T have a lifespan of over 50,000 hours. We've used them for nearly a year without changing the battery and will check back in about five years to share any updates.

holosun 509t battery access door

The Holosun EPS comes with an optional solar panel. This version is a bit pricier. Personally, I think the non-solar model of the Holosun EPS is a better buy.

 Given its long battery life and reliability, the solar feature seems less essential. The solar panel only powers the sight when there's enough ambient light, making it ineffective in dim settings.

The ShakeAwake feature also helps save battery by turning off the reticle when not in use.


  • Holosun EPS and 509T have similar optic window size
  • Holosun EPS and 509T have completely different mounting system
  • Holosun 509T sits taller than Holosun EPS despite their similar window sizes
  • Holosun 509T has finer turret adjustment than the EPS for better zeroing
  • Both optics last over 4 years
  • Both optics have side tray battery access