Is the Holosun 507Comp Really Better Than the 507C?

I have been a huge fan of Vortex Optics. That is why at my first Tactical Games event in Iowa I ran a Strike Eagle 1-8 LPVO, and why I eventually picked up a Vortex Defender XL for my pistol optic. Then I started having issues with the Strike Eagle, which opened the door to other options. I ended up buying an EOTech Vudu 1-10, and it has been amazing. This opened the door to Holosun.

Fast forward to designing my Platypus. The Defender XL uses a DeltaPoint Pro footprint and would not fit, so I went with an RMR cut. That left me with two Holosun optics to run on the same slide, which is how the Holosun 507Comp vs 507C X2 question turned into something I could actually answer. Is the 507 Comp worth the upgrade, or is the 507C X2 still enough?

Full Disclosure Before We Get Started

Holosun provided both the 507 Comp and the 507C X2 for testing. They did not ask for a script, talking points, or a good review. They told me to do my worst and give them my honest feedback. That is exactly what this is. Everything below is what these two dots did on my gun, at my matches, with my round count.

Why I Ran Both Holosun Dots

Using the 507C X2 for The Tactical Games Missouri Regional Event, with the 507 Comp coming in for The Tactical Games Iowa Regional Event. Two different optics, in the same season, on the same Hulk Platy. If you want the full write-up on the pistol itself, it is here: The Ultimate Stealth Arms Platypus Review: 2,500 Rounds of Truth.

Holosun calls the 507C the do-it-all optic, good for everyday carry, duty, and competition. I wanted to put that claim to the test, which is why it went to Missouri. The 507 Comp came next because it is the newer model with a much bigger window. I also was not a fan of the Solar Failsafe function on the 507C X2 for competition, though you can turn that feature off.

One thing I will say up front so nobody else has to. The 507C X2 is the previous generation and the 507 Comp is current. This was not a controlled lab test. It was two optics, two regionals, and one season of real shooting. The 507C X3 is out now and may close some of that gap, and I will get to that below.

Holosun 507C X2: The Proven Workhorse

The 507C X2 is the workhorse of the Holosun pistol lineup. It is the dot that shows up on everything from carry guns to match guns. Here are the features that matter from Holosun:

Multi-Reticle System (MRS): Selectable reticle options include a 2 MOA dot, 32 MOA circle, or combined circle dot for speed or precision shooting.
Red Super LED Technology: 650nm red emitter delivers a crisp aiming point with efficient power usage and up to 50,000 hours of battery life.
Solar Failsafe System: Integrated solar panel provides backup power and assists with brightness management in changing lighting conditions.
Shake Awake Technology: Motion activation instantly powers the optic on and powers down during inactivity to preserve battery life.
Manual Brightness with Lockout Mode: Brightness controls include memory and lockout functions to prevent accidental adjustments during carry or duty use.
12 Brightness Settings: 10 daylight and 2 night vision compatible brightness levels allow precise reticle adjustment across lighting environments.
Side Mounted Battery Tray: CR1632 battery compartment allows quick battery replacement without removing the optic from the slide.
7075-T6 Aluminum Housing: Hard anodized aluminum construction delivers strength and durability for demanding pistol applications.
RMR Footprint Compatibility: Industry standard RMR footprint allows direct mounting to a wide range of optics ready pistol slides.
IP67 Waterproof Construction: Sealed optic housing protects internal electronics from water, dust, and harsh environmental conditions.

I ran the 507C X2 in Missouri because it reminded me of my old DeltaPoint Pro. The window size is similar and the feel is familiar. Missouri threw mud, rain, and dirt at it and the dot never missed a beat. The emitter was bright enough in daylight, the window stayed clear, and it held zero through the whole event. I hit my targets with no issues and the smaller window never once got in my way.

Holosun 507C X2 vs X3: Which One Do You Have?

While I was running the X2, Holosun released the 507C X3. If you are shopping right now, know what you are looking at. The X3 adds a forward-facing light sensor that reads brightness off the target instead of the light behind you, improved glass, recessed solar panel and buttons so there is less to snag, a slightly taller window at 0.91 by 0.67 inches, a slightly lower deck height, and battery life that jumps from 50,000 to 100,000 hours. The footprint and the Multi-Reticle System carry over unchanged.

Holosun did not kill the X2. They dropped the price on it and let it hold down the value slot while the X3 sits above it. That is worth knowing before you buy either one.

Holosun HS507COMP: The Upgrade

For The Tactical Games Iowa Regional Event I got to run the 507 Comp. I was curious how a competition-specific dot would hold up in Iowa and whether it would actually outperform the 507C X2. Here is what it brings, from Holosun:

Performance Reticle System (PRS): Selectable reticle options include a 2 MOA red dot with 8 MOA, 20 MOA, or 32 MOA circle options for speed, precision, or combined targeting.
Red Super LED Technology: 650nm red emitter provides a crisp reticle with efficient power usage and up to 50,000 hours of battery life.
Large Competition Viewing Window: 1.1 × 0.87 inch window provides a wide field of view for faster transitions and improved target tracking.
Shake Awake Technology: Motion activation instantly powers the optic on and powers down during inactivity to preserve battery life.
Manual Brightness with Lock Mode: Brightness controls include memory and lock mode to prevent unintended adjustments during competition or transport.
Side Mounted Battery Tray: CR1632 battery compartment allows quick replacement without removing the optic or losing zero.
12 Brightness Settings: Eight daylight and four night vision compatible brightness levels provide clear reticle visibility in varied lighting conditions.
7075-T6 Aluminum Housing: Hard anodized aluminum construction provides durability and strength for high round count competition use.
RMR Footprint Compatibility: Industry standard RMR footprint allows direct mounting to a wide range of optics ready pistol slides.
IP67 Waterproof Construction: Sealed optic housing protects internal electronics from water, dust, and harsh environmental conditions.

One thing the Comp does not have is Solar Failsafe. For a competition dot I do not miss it, but if you were planning to carry this thing, that is a difference worth knowing. The window is the real story here, and that is where the two optics separate.

Footprint and Fitment: What Will These Mount To?

There are not a ton of footprint standards out there for pistol red dots. The main ones you will run into are the Trijicon RMR, Leupold DeltaPoint Pro, Aimpoint ACRO, and Shield RMSc. Holosun went with the RMR footprint on most of their optics, which made it an easy call to have the Platy slide cut for RMR.

Since both the HS507COMP and the 507C X2 use that footprint, swapping optics was about as simple as it gets. No adapter plate, no new slide, no gunsmith. Back out two screws, drop the other optic on, torque it down, confirm zero. That is the whole process, and it is what made this comparison possible in the first place. Same pistol, same cut, same holster. The only variable was the optic sitting on top.

Both fit the Platypus perfectly. I am calling that out because we have all dealt with an RMR cut that ends up a hair too tight or slightly off, and suddenly you are shimming something or wondering why your zero keeps walking. Neither Holosun gave me that headache.

Window Size and Dot Pickup

The 507 Comp runs a 1.1 by 0.87 inch window. The 507C X2 runs 0.91 by 0.63. Do the math on the glass and the Comp gives you roughly 67 percent more viewing area. So does a bigger window actually mean better performance?

I will admit I have enjoyed shooting larger windows since I made the switch. I ran the Vortex Defender XL in competition and now the 507 Comp. Most people will tell you that a big window means you spend more time hunting for the dot. I have never had that problem, but I have also trained with a larger window. For me the big glass helps me pick the dot up faster, and it lets me run the 8 MOA circle without feeling like it is swallowing the whole sight picture.

Should You Get Red or Green?

Optic colors have multiplied over the years. We went from red only to green, and now gold. I want to focus on the two most people are choosing between.

I have an astigmatism, and green dots are supposed to be better for that. I have stuck with red anyway, and here is why. I am a competitive shooter in the Midwest. I have shot stages with green vegetation as the backdrop and lost a green dot in it. That is a bad time when the clock is running.

If you stay target focused, the starburst from an astigmatism mostly stops being a problem. Running a larger dot helps too. Both of the optics in this review are red, so take this section as a buyer’s aside rather than a head-to-head test.

The Multi-Reticle System: Does It Matter?

Both dots give you reticle options. With the smaller window on the 507C X2, I ran just the 2 MOA dot. The other reticles took up too much of the glass and pulled my eye around.

With the 507 Comp I kept the dot and added the 8 MOA circle around it. That combination has been great for competition. I get the larger aiming reference without losing the precision of the small dot underneath it.

Standard Holosun 507COMP vs the Ronin Version

This one trips people up, because the Ronin is not just a paint job. The Ronin has the dragon design on the housing, and it shares the same 1.1 by 0.87 window as the standard model. The reticle system is where they split.

The standard 507 Comp uses the Performance Reticle System, which gives you the 2 MOA dot with 8, 20, or 32 MOA circle options. The Ronin uses Holosun’s standard Multi-Reticle System, which is the 2 MOA dot and 32 MOA circle only. Color options differ too. The standard comes in red, green, and gold, while the Ronin is red or green.

If the 8 MOA circle is what you are after, and for competition it should be, buy the standard model.

Under Stress: Both Optics at The Tactical Games

Running two dots on the same pistol under the same stressors was the test I had in mind from the start. The Tactical Games is where optics either earn their spot or show you what they are.

In Missouri I dealt with mud, rain, and sand. The 507C X2 did not flinch. Dirt and water never touched the emitter, the window stayed clear, and I engaged targets without a hiccup. I picked the dot up easily and the smaller window never cost me anything. I shot pistol well and only dropped a few.

In Iowa I had the 507 Comp. The big window was nice and the dot came up fast. Being able to run the 8 MOA circle or drop back to the 2 MOA dot was a real perk. I shot pistol about the same as I did in Missouri.

So which one won? Honestly, neither. My results were the same with both. I prefer the 507 Comp because I like a bigger window, but the 507C X2 is an excellent choice for somebody who wants one dot that does everything.

Both held zero through everything I put them through. I smacked both of them on barricades. I had mud and water in both. Neither one lost zero or quit on me. I have around 2,000 rounds through the 507 Comp now and I am tracking that number, because I want to see how it looks further down the road.

Price and Value

Both of these dots give you a premium feature set at roughly half the price of the legacy brands.

The 507 Comp carries an MSRP of $435.28 and a street price right around $369.99, with some retailers running it lower. The 507C X2 sits at an MSRP of $364.69 with a street price in the $233 to $280 range, and it has come down since the X3 launched. The X3 is landing around $299.

Now compare that to the alternatives. The Trijicon RMR HD has an MSRP of $1,019 and streets around $774. The Trijicon SRO carries an MSRP in the $829 range and can be found between roughly $480 and $670 depending on reticle and dealer. The Vortex Defender XL has an MSRP of $599.99 with a street price of $399.99.

It is hard to beat what Holosun gives you for the money. Multiple reticle options, side-loading battery trays, Shake Awake, multiple emitter colors, and a bright dot. Both of mine are durable and both held zero through a full season of matches.

What I’d Change

Starting with the 507 Comp. I would like to see Holosun offer different housing colors. It only comes in black, and an FDE or OD Green option would be nice. My real gripe is the reticle switching. It is clunky and not intuitive to move between the options. I set mine to the 2 MOA dot with the 8 MOA circle and have not touched it since, mostly because changing it mid-season is more trouble than it is worth.

With the 507C X2 I would change the auto brightness. It was either too bright or not bright enough, and I never trusted it. The window is better than an RMR, which always feels cramped to me, but a little more glass would go a long way. At the brightest setting the dot starbursts quite a bit. That one is not a big deal though, because there are enough brightness settings that you never need to run it that high. It is plenty bright well before you get there.

Which Holosun Should You Buy?

It comes down to your use case.

If you want a dot that does everything, get the 507C X2. It works for everyday carry, duty, and competition, and it will not empty your wallet. It is the safe answer and it is a good answer.

If you are buying a competition dot, or something to put on your AR-15, get the 507 Comp. The bigger window, the clear glass, and the reticle options are built for exactly that. It is still rugged enough to take abuse, and it is the one I would hand somebody looking to level up their match gun.

To Make a Long Story Short

For competition, the 507 Comp is the better optic of the two. The 507C X2 keeps up just fine, but it shines as an EDC and duty dot.

The 507 Comp comes in at an MSRP of $435.28 and can be found around $369.99. The 507C X2 has an MSRP of $364.69 with a street price between $233 and $280. The Comp is more of an investment and it is worth it. The 507C X2 has a price point that is hard to argue with for what you get. The only thing that would stop me from buying another X2 is the release of the X3. Nothing is stopping me from buying the 507 Comp.

For competition I will always run the 507 Comp, and I still am. I am looking forward to running it through the 2027 season at The Tactical Games, Tac 2-Gun, and PCSL. Thank you to Holosun for letting me put both of these through the wringer.

A Parting Word

“for we walk by faith, not by sight” (2 Corinthians 5:7, NASB 1995)

We enjoy hearing from you all. Will you be buying the 507 Comp or the 507C X2? Or do you already own one? Comment below and let us know.