The Holosun 507 Pro Max vs 507COMP decision starts with the window. Both are large-window competition pistol optics, but the Pro Max gives you more glass to look through, a forward sunshade and Solar Failsafe. The standard 507COMP keeps the same basic reticle choices and side-loading battery in a slightly narrower, shorter housing.
Our take: the 507COMP makes sense when you want a spacious window without paying for features you do not need. Choose the 507 Pro Max when the larger opening and sunshade are the reasons you are shopping. A larger body does not mean more weight here: Holosun lists both at 1.7 oz.
Below, we look at each sight individually before comparing their dimensions, reticles, power systems and value. Holosun also writes the newer model as 507 PROMAX; it is the same family as the spaced-out 507 Pro Max name.
Holosun 507COMP: A Closer Look
Large Window, Smaller Overall Profile
The Holosun 507COMP has a 1.10 x 0.87-inch window and a body measuring 1.8 x 1.3 x 1.3 inches. It is already a substantial sight rather than a tiny carry optic. Its appeal is the combination of a broad rectangular opening, selectable reticles and accessible controls.
Compared with the Pro Max, the standard COMP saves a little width and height. That is useful if you like the large-window format but do not want the wider silhouette of the newer model. Neither adds magnification: both provide a 1x view, so the choice is about the window and features, not zoom.
The 507COMP is an open-emitter sight. The light source sits behind the lens, with an exposed space between them. Its water-resistant construction protects the optic’s electronics, but it does not turn that exposed space into a sealed chamber.
507COMP Reticle Options: CRS and PRS
The standard 507COMP combines a 2 MOA dot with selectable 8, 20 and 32 MOA circle options. That gives you a choice of reticle patterns within the same optic, rather than committing to one fixed dot size when you buy it.
Older Holosun literature calls this the Competition Reticle System, or CRS. The current 507COMP product page uses Performance Reticle System, or PRS. Both descriptions list the same dot and circle sizes. Seeing PRS on the Pro Max therefore does not, by itself, mean it offers reticle patterns missing from the standard COMP.
Red, green and gold versions are separate models. A green 507COMP stays green; changing the reticle pattern does not change its color. Our Holosun red vs green vs gold guide compares those color choices in more detail.
Side-Loading Battery and Familiar Controls
A replaceable CR1632 battery sits in a side tray, so battery access does not require removing the sight. Holosun rates battery life at up to 50,000 hours at setting six. That is a specified operating condition, not a promise that every brightness level and reticle selection will produce the same runtime.
The 507COMP has eight daylight brightness settings and four night-vision-compatible settings. Manual brightness adjustment lets you choose the illumination level, while memory retains the setting. Lockout helps prevent an accidental button press from changing it.
Shake Awake conserves power while the sight is idle and reactivates it when motion is detected. The standard COMP has no solar panel, so the replaceable battery remains its power source.
Construction and Everyday Ownership
A hard-anodized 7075-T6 aluminum housing, IP67 rating and RMR footprint round out the package. Those are not entry-level compromises made to leave room for the Pro Max: the newer model shares them.
The 507COMP is an appealing choice if the window, reticle selection and straightforward battery arrangement already cover what you want. You can browse the Holosun 507COMP collection to compare the available versions.
Holosun 507 Pro Max: What the Newer Sight Adds
A Taller, Wider Viewing Window
The Holosun 507 Pro Max window measures 1.18 x 0.98 inches. Both dimensions increase over the standard COMP, rather than simply stretching the sight sideways. If a generous viewing opening is at the top of your wish list, this is the most immediate reason to choose it.
Its body measures 1.8 x 1.4 x 1.38 inches. Length stays the same, while width grows by 0.1 inch and height by 0.08 inch. The published weight remains 1.7 oz, so the trade-off is extra bulk rather than a higher listed weight.
The Pro Max is still an open-emitter sight. The housing’s longer-looking front edge is a sunshade, not the front of an enclosed optical chamber.
The Forward Sunshade
The integrated shade projects forward above the lens and is designed to reduce glare in bright conditions. It is part of the housing, not a separate accessory you need to add to get the Pro Max’s distinctive profile.
If bright outdoor light is a recurring annoyance, the shade gives you a concrete feature to weigh against the standard COMP. If most of your time is indoors, the larger window may matter more to your decision than the shade. Either way, the attraction is a change you can identify, not simply a newer model name.
Solar Failsafe Without Giving Up a Replaceable Battery
The Pro Max adds Solar Failsafe, which provides backup power under suitable lighting. It also keeps the side-loading CR1632 battery used by the 507COMP. Solar support does not recharge that disposable cell or make battery replacement unnecessary.
The published battery-life rating is still up to 50,000 hours at setting six. That makes Solar Failsafe an additional power feature, not a higher quoted runtime. Moving between these two models also does not require keeping a different battery size on hand.
Manual brightness control, memory, lockout and Shake Awake remain part of the Pro Max package. You retain the familiar everyday controls while gaining the window, shade and solar panel.
PRS Reticles, Colors and Housing
The Pro Max Performance Reticle System offers a 2 MOA dot and 8, 20 and 32 MOA circle options. Red, green and gold versions are available in the family, each with its own fixed illumination color.
It retains a 7075-T6 aluminum housing and RMR footprint. Those shared features make it a close relative of the 507COMP, not a completely different type of optic. The reason to pay more, when there is a price difference, is the extra window space and added features rather than a new housing material or reticle size.
Explore the Holosun 507 Pro Max collection for the individual red, green and gold models.
Holosun 507 Pro Max vs 507COMP: Specifications Compared
| Feature | 507COMP | 507 Pro Max |
|---|---|---|
| Window size | 1.10 x 0.87 inches | 1.18 x 0.98 inches |
| Body: length x width x height | 1.8 x 1.3 x 1.3 inches | 1.8 x 1.4 x 1.38 inches |
| Listed weight | 1.7 oz | 1.7 oz |
| Emitter design | Open | Open |
| Magnification | 1x | 1x |
| Reticle choices | 2 MOA dot; 8, 20 and 32 MOA circle options | 2 MOA dot; 8, 20 and 32 MOA circle options |
| Reticle-color versions | Red, green, gold | Red, green, gold |
| Forward sunshade | No | Yes |
| Solar Failsafe | No | Yes |
| Battery and access | CR1632; side tray | CR1632; side tray |
| Rated battery life at setting six | Up to 50,000 hours | Up to 50,000 hours |
| Brightness levels | 8 daylight; 4 night-vision-compatible | 8 daylight; 4 night-vision-compatible |
| Shake Awake, memory and lockout | Yes | Yes |
| Housing | 7075-T6 aluminum | 7075-T6 aluminum |
| Water-resistance rating | IP67 | IP67 |
| Mounting footprint | RMR | RMR |
How Much Larger Is the 507 Pro Max Window?
Using the published width and height, the Pro Max has about 21% more rectangular window area. The difference is 0.08 inch in width and 0.11 inch in height. That is a useful way to picture the size change, although the area calculation is not a measurement of magnification or shooting performance.
The standard COMP does not become a small-window optic beside it. The decision is whether you want additional room beyond an already generous opening. If the existing 507COMP window feels right to you, the shade and solar panel become the more important reasons to consider a change.
Same RMR Footprint, Different Body Size
Both sights use an RMR footprint. That describes the mounting interface; it does not mean their complete housings have identical dimensions. The Pro Max is wider and taller, so a shared footprint alone does not settle every fit or clearance question.
Before replacing an existing sight, confirm compatibility with the specific slide or plate and any holster you use. Our Holosun optic footprint guide explains the differences between the RMR, K and other Holosun interfaces.
What You Do Not Need to Upgrade For
You do not need the Pro Max just to get selectable circles, a side-loading battery, Shake Awake or an aluminum housing. The standard COMP already includes those features. Both also carry the same listed weight and battery-life rating.
If your goal is an enclosed emitter, neither of these models makes that change. The Holosun 509T vs EPS comparison covers two enclosed alternatives instead.
Is the 507 Pro Max Worth the Upgrade?
For a first purchase: compare the current prices for the same reticle color. If the gap is modest and you already prefer the larger window, the Pro Max gives you the extras from the start. If the standard COMP costs meaningfully less, it retains much of the same feature set and deserves consideration on its own merits.
For an existing 507COMP owner: start with what you wish were different. More window space, a forward shade or solar backup are specific reasons to move. If none of those solves a concern you have, keeping the COMP is a sensible choice.
For shoppers who prefer a simpler reticle: a fixed-dot model may be more appealing than either selectable-reticle option. Our 507COMP vs 407COMP guide focuses on that comparison.
The best fit is not automatically the newest sight. Choose the 507COMP for its large window and shared core features in the smaller housing. Choose the 507 Pro Max when the enlarged window, sunshade and Solar Failsafe are features you specifically want.
Holosun 507 Pro Max vs 507COMP FAQs
The Pro Max has a larger window, a wider and taller body, an integrated forward sunshade and Solar Failsafe. The standard 507COMP shares its basic reticle choices, battery type, RMR footprint and listed 1.7 oz weight.
Yes. Holosun uses 507 PROMAX in its model naming, while 507 Pro Max is the commonly spaced version. Red, green and gold identify separate reticle-color variants within that family.
The 507 Pro Max window is 1.18 x 0.98 inches. The 507COMP window is 1.10 x 0.87 inches. Calculating width times height gives the Pro Max approximately 21% more rectangular window area.
No, not according to Holosun’s published specifications: both are listed at 1.7 oz. The Pro Max housing is wider and taller despite having the same listed weight.
CRS stands for Competition Reticle System, the name used in older 507COMP literature. Holosun’s current 507COMP page uses PRS, or Performance Reticle System. Both list a 2 MOA dot and 8, 20 and 32 MOA circle options, also offered on the Pro Max.
Yes. Both use the RMR footprint. The Pro Max has a larger housing, so compatibility with your specific slide, plate and holster still matters.
No. The CR1632 is a replaceable battery, not a rechargeable cell. Solar Failsafe provides supplementary power in suitable light; it does not replace normal battery maintenance.
No. Both the 507 Pro Max and 507COMP are open-emitter sights. The Pro Max sunshade extends above the lens but does not enclose the emitter.
Specifications: Holosun HS507COMP-RD and Holosun HS507-PROMAX-RD-PRS.
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