The Holosun 507COMP has become a popular choice among competitive pistol shooters because of its oversized window, durable construction, and highly adaptable reticle system.
Now, the Holosun 507 PROMAX takes that same competition-focused formula and makes it even bigger.
Both optics are designed primarily for competition shooting. Both are available with red, green, or gold reticles. They also share the same mounting footprint, battery type, battery-life rating, brightness settings, construction materials, and selectable reticle options.
The biggest differences come down to two things:
- The 507 PROMAX has a larger viewing window and slightly larger overall body.
- The 507 PROMAX adds Solar Failsafe and an integrated forward-leaning sunshade.
This comparison will explain how the Holosun 507 PROMAX and 507COMP are similar, how they are different, and which optic may be the better choice for your competition pistol.
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Starts at $369.99 
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Starts at $399.99 
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Quick Answer: 507 PROMAX vs. 507COMP
The Holosun 507COMP is the better choice for shooters who want a large competition window without making the optic any bigger than necessary.
The Holosun 507 PROMAX is for shooters who want the largest possible sight picture and do not mind adding a little extra width and height to their pistol setup. It also adds Solar Failsafe and a forward sunshade for improved performance in bright outdoor conditions.
The 507 PROMAX is not heavier than the 507COMP based on the listed specifications. Both optics weigh 1.7 ounces. The PROMAX is simply wider, taller, and equipped with a larger window.
Holosun 507 PROMAX vs. 507COMP Specifications
| Feature | Holosun 507COMP | Holosun 507 PROMAX |
|---|---|---|
| Intended Use | Competition | Competition |
| Window Size | 1.1" × 0.87" | 1.18" × 0.98" |
| Body Dimensions | 1.8" × 1.3" × 1.3" | 1.8" × 1.4" × 1.38" |
| Weight | 1.7 oz | 1.7 oz |
| Reticle System | PRS, formerly called CRS | PRS |
| Reticle Options | 2 MOA dot with 8, 20, or 32 MOA circles | 2 MOA dot with 8, 20, or 32 MOA circles |
| Reticle Colors | Red, green, or gold | Red, green, or gold |
| Solar Power | No | Yes |
| Forward Sunshade | No | Yes |
| Battery | CR1632 | CR1632 |
| Battery Life | Up to 50,000 hours | Up to 50,000 hours |
| Battery Location | Side tray | Side tray |
| Brightness Settings | 8 daylight and 4 night vision | 8 daylight and 4 night vision |
| Shake Awake | Yes | Yes |
| Lockout Mode | Yes | Yes |
| Housing Material | 7075-T6 aluminum | 7075-T6 aluminum |
| Mounting Footprint | RMR | RMR |
| Waterproof Rating | IP67 | IP67 |
| Vibration Rating | 5000G | 5000G |
The Biggest Difference: Window Size
The main reason to choose the 507 PROMAX over the 507COMP is its larger viewing window.
The 507COMP has a 1.1-inch by 0.87-inch window. That is already a very large window for a pistol-mounted red dot and is one of the reasons the 507COMP has become so popular among competition shooters.
The 507 PROMAX increases the window to 1.18 inches by 0.98 inches.
That may not sound like a massive difference when looking only at the measurements, but the increased width and height create a noticeably larger viewing area. The added height is especially important because it gives the shooter more room to find and track the reticle during recoil.
A larger window can help during competition by making it easier to:
- Find the reticle during the presentation
- Track the reticle as the pistol cycles
- Maintain visual contact during recoil
- Transition quickly between multiple targets
- Recover from an imperfect draw or presentation
- Shoot from awkward or unconventional positions
A larger window does not mechanically make the pistol more accurate. However, it can make the optic more forgiving.
With a smaller window, an imperfect presentation may place the reticle outside the visible area. With a larger competition window, the shooter has more room for error and a better chance of immediately seeing the reticle.
The 507COMP already performs extremely well in this area. The 507 PROMAX simply takes the large-window concept farther.
Overall Optic Size
The larger window also means the 507 PROMAX has a larger overall body.
The 507COMP measures:
1.8 inches long × 1.3 inches wide × 1.3 inches tall
The 507 PROMAX measures:
1.8 inches long × 1.4 inches wide × 1.38 inches tall
Both optics are the same length, but the PROMAX is approximately 0.1 inch wider and 0.08 inch taller.
The difference is not enormous on paper, but the PROMAX will look and feel noticeably larger when mounted on a pistol. It is a very large pistol optic designed for shooters who prioritize maximum window size over having a compact or streamlined setup.
Interestingly, both optics weigh 1.7 ounces according to the listed specifications. That means the PROMAX provides its larger body and window without a weight penalty.
Still, physical size and weight are not the same thing. Even though the PROMAX does not weigh more, its larger housing may extend farther beyond the sides of narrower pistol slides.
That will not matter to most dedicated competition shooters, but it may matter if the pistol is also used for concealed carry, duty use, or other applications where a smaller profile is preferable.
Reticle System: CRS vs. PRS Explained
The Holosun 507COMP and 507 PROMAX use the same selectable reticle system, but shoppers may see two different names used for it.
When the 507COMP was originally released, Holosun referred to its reticle system as the Competition Reticle System, or CRS.
Holosun has since updated the name to the Performance Reticle System, or PRS, matching the terminology used for the 507 PROMAX.
If you see the 507COMP described as having CRS on older product pages, packaging, reviews, or videos, it does not mean that optic has a different reticle. CRS and PRS refer to the same selectable reticle options.
Holosun appears to be standardizing around the PRS name going forward.
Both optics allow the shooter to choose between:
- 2 MOA dot
- 8 MOA circle
- 20 MOA circle
- 32 MOA circle
Because both models offer the same reticle choices, the reticle system itself is not a major difference between the 507COMP and 507 PROMAX.
The bigger difference is that the PROMAX displays those reticles inside a larger and more open viewing window.
2 MOA Dot
The 2 MOA dot is the most precise option. It provides a small aiming point that works well for longer shots, partial targets, steel plates, and stages where accuracy matters more than raw speed.
The tradeoff is that a smaller dot can be slightly harder to locate during a fast presentation, especially at lower brightness settings.
8 MOA Circle
The 8 MOA circle provides a larger aiming reference while remaining relatively precise. It can offer a useful balance between speed and accuracy for competition shooters who find a 2 MOA dot too small.
20 MOA Circle
The 20 MOA circle is easier to see and can be picked up quickly during fast stages. It gives the shooter a larger visual reference without filling as much of the window as the 32 MOA option.
32 MOA Circle
The 32 MOA circle provides the largest and most visually aggressive aiming reference. It is designed for rapid acquisition and can be particularly useful on close-range targets where speed is the priority.
Both models are also offered with red, green, or gold illumination, allowing shooters to select the reticle color that is easiest for their eyes to see.
Solar Failsafe
One of the most important feature differences is that the 507 PROMAX includes Solar Failsafe, while the 507COMP does not.
The solar panel on the PROMAX can provide supplemental power and automatic brightness assistance based on surrounding light conditions. It also acts as a backup power source if the battery becomes depleted.
This can be particularly useful during outdoor competition, where lighting conditions may change throughout the day.
A shooter may begin a stage under a covered structure and then move into direct sunlight. The solar system gives the PROMAX another way to respond to changing environmental conditions and maintain a visible reticle.
The 507COMP remains entirely dependent on its CR1632 battery. Its long battery life and Shake Awake system still make it highly dependable, but it does not have the additional solar backup found on the PROMAX.
It is important to understand that the solar panel does not eliminate the need for a battery. The CR1632 battery remains the optic’s primary power source, particularly in low-light or indoor environments.
Solar Failsafe is best viewed as an additional layer of power redundancy rather than a replacement for normal battery maintenance.
Forward-Leaning Sunshade
The 507 PROMAX also has an integrated forward-leaning sunshade.
This extended front portion of the housing is designed to reduce glare and help preserve reticle clarity in bright environments. It can be especially beneficial during outdoor matches when the shooter is facing the sun or dealing with strong overhead lighting.
The sunshade also contributes to the distinctive appearance of the PROMAX. It gives the optic a larger and more aggressive profile than the 507COMP.
The 507COMP does not include this extended sunshade. Its housing is more traditional and slightly more compact.
For indoor competition, the sunshade may not provide a major advantage. For outdoor shooters who frequently compete in direct sunlight, it may be a more valuable addition.
Battery Life
Both the 507COMP and 507 PROMAX use a removable CR1632 battery and are rated for up to 50,000 hours of battery life at brightness setting six.
That means battery life is essentially equal between the two models under the listed test conditions.
Both optics also include Shake Awake technology. The optic can enter a low-power state after a period of inactivity and immediately reactivate when movement is detected.
This helps extend battery life without requiring the shooter to manually turn the optic on and off before every use.
Both models also use a side-loading battery tray. The battery can be replaced without removing the optic from the pistol, helping the shooter preserve zero and avoid unnecessarily disturbing the mounting screws.
The PROMAX does have an additional power advantage because of its Solar Failsafe system. However, its published battery-life rating remains the same as the 507COMP.
For a competition shooter, the practical battery routine should also be the same with either model: replace the battery on a regular schedule rather than waiting for it to fail.
Brightness Controls
Both optics have 12 brightness settings:
- Eight daylight settings
- Four night vision-compatible settings
Both models provide manual brightness control, memory, and lockout mode.
Memory allows the optic to return to the previously selected brightness setting when powered on.
Lockout mode prevents accidental changes to the brightness or reticle settings. This can be especially useful during competition, where unintentionally pressing a button could leave the reticle too bright, too dim, or set to the wrong configuration.
Although the PROMAX has Solar Failsafe and ambient-light assistance, its listed specifications do not describe it as having a standard automatic-brightness mode. Shooters can still manually select and lock their preferred brightness level.
Durability and Construction
The 507COMP and 507 PROMAX are constructed from 7075-T6 aluminum.
Both have a hard-anodized finish, an IP67 waterproof rating, and a 5000G vibration rating. They are designed to withstand the movement, recoil, and high round counts associated with competition shooting.
Both models also have:
- A ±30 MOA windage and elevation adjustment range
- 1 MOA adjustment clicks
- Operating temperatures from -30°C to 60°C
- Storage temperatures from -40°C to 70°C
- Multi-coated lenses
- Unlimited eye relief
- A 1x, non-magnified sight picture
From a construction and durability standpoint, there is very little separating the two optics.
The PROMAX is not necessarily intended to be a more rugged version of the 507COMP. Its primary improvements are the larger viewing area, solar capability, and glare-reducing sunshade.
Mounting Footprint
Both optics use the RMR mounting footprint.
This is one of the most widely supported full-size pistol optic footprints. Depending on the pistol, either optic may mount directly to the slide or require an appropriate adapter plate.
Using the same footprint also makes it easier for a shooter who already owns a 507COMP to move to the 507 PROMAX without completely changing the mounting system.
However, the larger external dimensions of the PROMAX should still be considered. Just because the mounting footprint fits does not necessarily mean the optic’s body will look proportional on every slide.
The PROMAX will make the most visual and practical sense on full-size competition pistols. It may look oversized on compact or narrow slides, although that does not necessarily prevent it from functioning correctly.
Who Should Choose the Holosun 507COMP?
The 507COMP is a strong choice for the shooter who wants a large, competition-oriented window without choosing the biggest optic possible.
It provides:
- A large 1.1-inch by 0.87-inch window
- Multiple competition-focused reticle options
- Up to 50,000 hours of battery life
- Shake Awake technology
- A side-loading battery
- Lockout mode
- An RMR footprint
- Durable 7075-T6 aluminum construction
The 507COMP is likely the better choice if you want a large window but still care about keeping the pistol’s overall profile somewhat controlled.
It may also be better for a pistol that serves more than one purpose. Although the 507COMP is designed for competition, its smaller housing makes it slightly more practical than the PROMAX for general range use or a pistol that occasionally needs to be carried.
Most importantly, the 507COMP already has a very large window. Shooters who are satisfied with its current sight picture may not gain enough from the PROMAX to justify changing optics.
Who Should Choose the Holosun 507 PROMAX?
The 507 PROMAX is for the competition shooter who wants the largest and most forgiving sight picture possible.
It offers:
- A larger 1.18-inch by 0.98-inch viewing window
- A slightly wider and taller housing
- Solar Failsafe
- An integrated forward sunshade
- The same versatile Performance Reticle System
- The same 50,000-hour battery-life rating
- The same 1.7-ounce weight
- The same RMR footprint
The PROMAX makes the most sense on a dedicated competition pistol where concealability, compactness, and a streamlined appearance are not priorities.
It is particularly appealing for shooters who struggle to find the reticle during presentation or lose it while tracking recoil. The additional window area creates more room to see the reticle, especially when the pistol is not perfectly aligned with the shooter’s eye.
Outdoor competitors may also benefit from the solar panel and forward sunshade.
The PROMAX is unapologetically large. That is not a flaw—it is the entire point of the optic.
Is the 507 PROMAX Better Than the 507COMP?
The 507 PROMAX is not automatically better for every shooter.
It is better if your main priority is maximizing the size of the viewing window. It also offers additional features through Solar Failsafe and its integrated sunshade.
However, the 507COMP provides the same reticle options, battery-life rating, construction material, weight, mounting footprint, brightness settings, and core competition features in a slightly smaller package.
The decision comes down to how much you value the extra window area.
Choose the 507COMP if you want a large competition optic that offers a strong balance of window size, durability, and overall dimensions.
Choose the 507 PROMAX if you want to maximize window size and are comfortable mounting a very large optic on your competition pistol.
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Starts at $369.99
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Starts at $399.99
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Final Thoughts
The Holosun 507COMP and 507 PROMAX are both designed for shooters who value speed, visibility, and reticle flexibility during competition.
They share far more similarities than differences. Both use Holosun’s Performance Reticle System, both are available in red, green, and gold, and both offer excellent battery life, Shake Awake, lockout controls, side-loading batteries, rugged aluminum housings, and RMR footprint compatibility.
Shooters researching the 507COMP may still see its reticle referred to as the Competition Reticle System, or CRS. That is the older name for what Holosun now calls the Performance Reticle System, or PRS. The selectable reticles are the same.
The biggest distinction between the two optics is size.
The 507COMP is already a large competition optic. The 507 PROMAX takes that concept to the next level with an even larger window, a taller and wider body, Solar Failsafe, and a forward sunshade.
For most shooters, the 507COMP provides more than enough window space. For the shooter who believes there is no such thing as too much window, the 507 PROMAX is the clear choice.
