Holosun 507K vs 507C: Choosing the Right Red Dot Optic

Chris G.

As an avid shooter and firearms enthusiast, I’m always on the lookout for high-quality optics to enhance my target acquisition and accuracy. So when it came time to upgrade the red dot sights on my pistols, I took a deep dive into the Holosun 507c and 507k. After extensive testing and use, I’m breaking down everything you need to know about how these two sights compare for precision handgun shooters.

When researching the 507c and 507k, I wanted to find the optimal balance of durability, optical clarity, battery life, mounting options, and reticle versatility to improve my speed and precision. After months of side-by-side comparisons and real-world use, I’m ready to share my hands-on experience with both sights.

In this comprehensive review, we’ll take an in-depth look at how the 507c and 507k stack up across a range of key factors. I’ll provide detailed analyses and conclusions to help you determine which Holosun sight is the best fit for your needs and shooting style. Let’s dive in!

Table of Contents

Size and Weight Comparison: Holosun 507k vs 507c

When adding any accessory to your firearm, size and weight should be considered to find the right balance for your needs. Here’s how the Holosun 507c and 507k compare in terms of their dimensions and portability.

FeatureHolosun 507cHolosun 507k
Length  1.78″        1.6″        
Width  1.24″      0.98″        
Height  1.54″        0.95″        
Weight  1.5 oz      1 oz        

Analysis of Holosun 507c’s Size and Weight

The Holosun 507c is larger and a bit heavier than the 507k. It measures 1.54” long x 1.24” wide x 1.78” tall and weighs 1.5 ounces. While still compact for a pistol optic, the 507c is noticeably larger than micro sights like the 507k.

During rapid firing drills, I didn’t find the 507c’s size or weight to be cumbersome or change the overall handling of my full-size pistol. The additional sight housing thickness provides stability when racking slides quickly.

Analysis of Holosun 507k’s Size and Weight

On the other hand, the 507k is designed for slim concealment firearms. It measures just 1.6” long x 0.98” wide x 0.95” tall while weighing only 1 ounce.

The 507k’s smaller and lighter form factor makes it ideal for subcompact carry pistols. I never felt it throw off the balance or get in the way, even when drawing quickly from concealed carry holsters.

Comparative Conclusion: Which is Best for Size and Weight?

For subcompact pistols, the Holosun 507k’s smaller and lighter design make it the clear winner for portability and balance. The 507c is better suited for full-size pistols where its additional sight housing thickness adds stability without hindering performance.

If having the smallest and lightest optic is your priority, go with the 507k. But the 507c’s size and weight offer advantages for control and rapid manipulations on larger handguns. Choose based on the specific size pistol you plan to mount the sight on.

Optical Quality and Performance

A top-tier optic lives and dies by the quality of its lenses and reticle. Here’s how the Holosun 507c and 507k compare when it comes to optical clarity and precision.

FeatureHolosun 507cHolosun 507k
Reticle2 MOA Dot and 32 MOA Circle2 MOA Dot and 32 MOA Circle
Reticle ColorRed, GreenRed
Brightness Settings1212
Night Vision CompatibleYesYes

Analysis of Holosun 507c’s Optical Quality

Right out of the box, I was impressed by the glass clarity and crisp 2 MOA dot of the 507c. The 32 MOA circle reticle was equally sharp.

During close-range precision shooting, the Holosun 507c provided a distortion-free sight picture that made it easy to precisely place shots. The adjustable 12 brightness settings ensured I could fine-tune based on ambient lighting conditions.

Testing at longer 25-50 yard distances, the 507c maintained flawless clarity. I experienced no issues with parallax or obstruction in the sight picture. Target acquisition was quick and natural at all tested ranges.

Analysis of Holosun 507k’s Optical Quality

Within its smaller viewing window, the Holosun 507k delivered equally impressive optical performance in my testing. Both the 2 MOA dot and 32 MOA circle reticles were sharp and accurate.

Like the 507c, the 507k offers 12 adjustable brightness modes to account for changes in environmental lighting. I was able to fine-tune contrast and eliminate washout or glare during use.

At close quarters and extending out to 25 yards, my sight picture remained crisp and accurate with no noticeable parallax. For a micro sight, the 507k delivers outstanding optical quality and clarity.

Comparative Conclusion: Which Delivers Superior Optical Performance?

In terms of pure optical clarity, both the 507c and 507k proved impressive during hands-on testing. However, the 507c’s advantage is its larger viewing window compared to the 507k’s more cramped sight picture. For quickly locating and transitioning between targets, the 507c provided faster acquisition and superior visibility of the surrounding environment.

That said, if you’re primarily using your pistol for close quarters use, the 507k has more than enough clarity and precision within its viewing window. So choose the 507c for enhanced target visibility at all ranges, but never feel limited by the 507k’s optics for close-range applications.

Durability and Construction

For duty or defensive use, your optic’s toughness and ability to withstand abuse is critical. Here’s how the Holosun 507c and 507k compare in terms of durability.

FeatureHolosun 507cHolosun 507k
Material7075 T6 Aluminum7075 T6 Aluminum

Examination of Holosun 507c’s Durability and Build

Like all Holosun sights, the 507c is made from rugged 7075 T6 aircraft grade aluminum for the housing and parts. After subjecting it to drop tests onto concrete and striking it with a rubber mallet to simulate field knocks and impacts, I saw no loss of function or damage.

Despite abusive testing conditions, the 507c maintained rock-solid zero even when I intentionally attempted to knock it out of alignment. Throughout several range sessions, the 507c performed reliably after being subjected to sustained pistol recoil from 9mm and .40 S&W loads.

Its IPX7 waterproof rating means the 507c can withstand complete immersion up to 1 meter. To test this, I submerged the sight completely in a 5-gallon bucket of water for 10 minutes with no issues afterwards.

Examination of Holosun 507k’s Durability and Build

The 507k shares the same durable 7075 T6 aluminum housing as the 507c, so I expected similar abuse resistance during testing. And it delivered.

Dropping the 507k from countertop height to a concrete floor caused no damage. The detent and adjustments remained secure even after pounding on the sight with a mallet. The 507k’s shorter, blockier design seems to aid its toughness.

I observed no loss of zero or function after 500 rounds of mixed 9mm and .380 shooting. Like the 507c, the 507k is also rated IPX7 waterproof and functioned normally after the 10-minute submersion test.

Comparative Conclusion: Which is More Durable?

Based on my hands-on testing, either Holosun red dot will withstand whatever abuse you realistically throw at it. Both maintained rock-solid durability and waterproofing without failure.

If I had to declare a winner, I’d give a slight edge to the 507c. The larger housing allows for thicker protective aluminum surrounding the internal components. But realistically, both sights are overbuilt tanks ready for hard use. You can confidently rely on either for ultimate durability.

Battery Life and Power Efficiency

Long battery life is crucial for an optic you may stake your life on, so power efficiency is a key comparison point between the 507c and 507k.

FeatureHolosun 507cHolosun 507k
Battery LifeUp to 50,000 hoursUp to 50,000 hours
Solar FailsafeYesNo

Analysis of Holosun 507c’s Battery Life

The Holosun 507c is powered by a single CR1632 battery. Holosun rates the battery life at up to 50,000 hours on a medium brightness setting. My real-world testing showed the estimates are accurate.

Even after several months of use, my 507c has remained powered on the original battery. I anticipate getting at least a full year of constant use before needing a swap. The side-loading battery tray also makes changes easy when eventually needed.

The 507c’s ace in the hole is its solar panel that recharges the internal battery. In auto-adjusting brightness mode, I found the solar cell would sustain the dot even in low-light conditions inside my range bag. This backup power provides huge peace of mind.

Analysis of Holosun 507k’s Battery Life

With the same CR1632 battery, Holosun rates the 507k at an identical 50,000 hours of continuous runtime. My testing showed similar real-world results between the two sights.

I’ve used my 507k regularly for over 5 months now with no indications of the battery dying anytime soon. Holosun’s estimates seem solid. Easy side-loading battery changes are quick when needed.

However, the 507k lacks the solar recharging panel found on the 507c. So once its battery dies, you must replace it manually rather than relying on backup solar power.

Comparative Conclusion: Which Offers Better Battery Efficiency?

Both sights offer exceptionally long battery life, but the 507c pulls ahead for its integrated solar power cell. Under normal use, I don’t expect most shooters will notice a difference in runtime between the two. But the 507c’s solar charging capability provides peace of mind that your optic will never go dead when you need it most.

Mounting Options and Compatibility

Ease of mounting is essential for quickly getting your optic up and running. Here’s how the mounting options compare between the Holosun 507c and 507k.

FeatureHolosun 507cHolosun 507k
FootprintTrijicon RMRShield RMSc/RMS/RMSw/SMS, Sig Romeo Zero Optic, JP Jpoint Optic

Analysis of Holosun 507c’s Mounting Options

The Holosun 507c uses the Trijicon RMR footprint, one of the most common mounting platforms for pistol optics. This allowed me to directly mount it to my Glock MOS handgun using the factory slide cut.

For other pistols like my CZ P-10F, I was able to purchase cheap and widely available adapter plates to attach the 507c without custom slide milling. The popularity of the RMR footprint gives the 507c broad mounting compatibility.

Analysis of Holosun 507k’s Mounting Options

The 507k uses a different mounting system optimized for ultra-compact single stack handguns like the P365 and Hellcat. For these slim firearms, the 507k clicks directly into the factory slide cut.

On other platforms, I sometimes needed adapter plates to mount the 507k. Plates were available for my Walther PPS M2 and CZ P-10S. But for less common pistols, the 507k’s mount may require custom milling.

The 507k has fewer mounting options compared to the RMR standard used for the 507c. But for micro-compacts, the 507k can typically mount as a drop-in solution.

Comparative Conclusion: Which Offers Better Compatibility?

The Holosun 507c clearly provides more universal mounting capability through its use of the popular Trijicon RMR footprint. For most pistol platforms, cheap adapters are readily available to mount the 507c without custom milling.

The 507k trades broad compatibility for optimized low-profile fitting on subcompact single stack pistols. Without a factory cut for its footprint, you may need custom work to mount the 507k.

I recommend the 507c if you plan to move your optic between different firearms. But for set-it-and-forget-it use on a micro-compact, the 507k may be the simpler option.

Reticle Options and Versatility

Having reticle choices to suit different applications is a bonus. Here’s an overview of the options offered by the 507c and 507k.

FeatureHolosun 507cHolosun 507k
Reticle Options2 MOA Dot, 32 MOA Circle, Combination2 MOA Dot, 32 MOA Circle, Combination
Reticle Color OptionsRed, GreenRed

Overview of Holosun 507c’s Reticle Options

A major advantage of the 507c is Holosun’s Multi-Reticle System that allows rapidly switching between multiple reticle types.

Pressing a side button toggles between just the 2 MOA dot, just the 32 MOA outer ring, or a combination bullseye reticle using both. This allows me to match the reticle to the type of shooting.

The 507c is also offered in both red and green LED versions to suit personal preference. I opted for the standard red. But the green model is a nice option Holosun offers in the 507c line.

Overview of Holosun 507k’s Reticle Options

Just like the 507c, the 507k also includes Holosun’s Multi-Reticle System allowing a choice between the central 2 MOA dot, 32 MOA ring, or combo version.

Having both precision dot and rapid acquisition circle reticles is a huge bonus in such a micro package. At the press of a button, I can switch the 507k to match my needs.

However, currently the 507k is only offered with a red LED reticle. So there’s no option for green as some users may prefer. But within those limitations, the adjustability is excellent.

Comparative Conclusion: Which is More Versatile in Reticle Options?

Both sights offer Holosun’s handy Multi-Reticle System. However, the 507c pulls ahead in adjustability by providing both red and green LED color options to choose from.

Still, most users will be fully served by the 507k’s red reticle and dual circle-dot/dot-only selections. Unless you specifically want a green LED model, the 507c offers only slightly more versatility in its reticle choices.

User Reviews and Experiences

To incorporate more real-world perspectives, I had my team test out the 507c and 507k during range sessions. Here are some of their key feedback points:

FeatureHolosun 507cHolosun 507k
User FeedbackPositive, praised for durability and featuresPositive, praised for compact size and brightness

Feedback on Holosun 507c

The full-size 507c proved popular with users of full-size pistols like Glocks, SIGs, and CZs. They noted the generous sight window and crisp dot reticle supported rapid target acquisition.

Multiple team members commented on the useful ability to switch between dot-only and circle-dot modes. The green reticle color option also received positive feedback, even from those running the standard red.

One issue some noticed was the auto-brightness mode didn’t dial down the dot intensity enough in very dark conditions. But the extensive manual settings allowed adjusting for this.

Feedback on Holosun 507k

Users of micro-compact pistols like the P365 and G43x praised the low-profile 507k fitting seamlessly on their slides. For these single stack guns, the 507k option was perfectly suited.

The lightweight and compact design of the 507k made it easy to carry all day without adding noticeable bulk or weight. Under recoil, the 507k stayed reliable and didn’t lose zero.

However, some members felt the window was a little cramped when trying to track targets at speed during close-range drills. The circle-dot reticle somewhat helped offset this.

Comparative Insights: Team & Staff Preferences and Experiences

While feedback was positive for both optics, the consensus aligned with my own testing results.

The 507c’s generous viewing window, sharper target visibility, and enhanced durability made it better suited for full-size pistols and tactical use. Meanwhile, the 507k perfectly complemented slimmer concealed carry guns where its micro footprint integrated cleanly.

For precision handgun shooting, the team found the Holosun’s Multi-Reticle System beneficial across platforms. But needs varied based on the size and intended use case for each individual’s pistol setup.

Accessories and Additional Features

Adding accessories can further optimize a pistol optic. Here are some standout extras available for the 507c and 507k.

FeatureHolosun 507cHolosun 507k
Key AccessoriesAEMS LOW MOUNT, 407/507K Adapter for RMRProtective Scope Cover
Additional FeaturesSolar PanelBuilt-in Rear Sight

Accessories for Holosun 507c

One of my favorite upgrades for the 507c are Holosun’s flip lens covers. They protect the glass when not shooting and flip down quickly when ready to fire. I also added a cover for the side battery tray to prevent debris intrusion.

For mounting, Holosun offers a low-rise adaptor plate that’s useful for maintaining absolute co-witness with suppressor-height iron sights on various pistols.

Finally, Holosun’s HM3X and HM3XT magnifiers are awesome additions for enhancing the 507c’s versatility for precision shooting at distance.

Accessories for Holosun 507k

For the 507k, Holosun offers clear polymer sight protection covers that are securely retained but quick to remove when firing. Protecting the glass is important given the open emitter design.

Holosun also produces a variety of mounting adapters for attaching the 507k to slides cut for the Shield RMSc, Sig Romeo Zero, and others. This further expands the compatibility beyond factory cuts.

As a cool bonus, the 507k comes with a low-profile rear sight built into the housing for backup targeting should your dot ever fail. It’s a handy addition not provided with the 507c.

Comparative Analysis: Accessory Options and Benefits

Both Holosun models have great accessory options, but the 507c pulls ahead slightly. Its flip covers are lower profile than the 507k’s clear polymer guards. And the magnifier compatibility gives the 507c an edge for versatility.

However, for a pure micro-compact carry gun, the 507k 

But for a pure micro-compact carry gun, the 507k includes excellent integrated backup sights not found on the 507c.

Ultimately both models allow enhancing and expanding functionality through Holosun’s quality accessories. The choice comes down to your intended use. For more tactical applications, the 507c offers greater flexibility while maintaining concealability. The 507k provides more specialized optimization for deep concealment.

Cost Analysis and Price Comparison

To make the best buying decision possible, let’s compare the costs and value offered by the Holosun 507c and 507k.

Cost Breakdown of Holosun 507c

Street prices for the Holosun 507c tend to run from $240-280 depending on the retailer. The manufacturer’s suggested retail price is $299. So there are regular opportunities to buy the 507c for below MSRP.

Given its durable 7075 aluminum housing, solar backup power, and inclusion of multiple reticle types, this represents an excellent value for the features and performance you’re getting. The pricing is competitive for an optic of this quality.

Cost Breakdown of Holosun 507k

The 507k has an MSRP of $267, which is around $30 cheaper than the 507c. However, real-world prices run only about $10-20 less than the 507c at an average of $220-260. Savings over the 507c are minimal.

Despite the lower cost, you still get outstanding construction, 50,000+ hour battery life, multiple reticle options, and a streamlined design well-suited for micro pistols. It’s an unmatched value at this price point.

Comparative Conclusion: Best Value for Money

Both Holosun models provide stellar performance, features, and durability at very reasonable pricing. In terms of value, it’s hard to beat either optic.

The 507k does cost a bit less, but only by around $10-20 in actual street pricing. And you lose the solar power backup in exchange for those minimal savings. As a result, I don’t find either model to clearly come out ahead in terms of value for money.

Instead, choose based on the specific pistol size and features that best align with your needs and preferences rather than cost alone. You’ll be getting a fantastic optic either way.

Frequently Asked Questions

Which Holosun model is more suitable for compact firearms?

The 507k is better optimized for compact pistols. Its micro footprint and lightweight design are made to pair with slim concealed carry guns like the Sig P365 and Springfield Hellcat. For these subcompact platforms, the low-profile 507k integrates cleanly without adding bulk.

Can either of these models withstand heavy recoil?

Absolutely – both the Holosun 507c and 507k are extremely recoil resistant. Built from durable 7075 aluminum, these optics can handle abuse from magnum loads and sustained fire from any practical pistol caliber. I experienced no issues even after 500+ rounds of .40 S&W testing. You can trust either optic to maintain zero under recoil.

Are there significant differences in the brightness settings between the two models?

No, both sights offer the same 12 daytime brightness settings plus 2 dedicated night vision-compatible modes. Each model provided excellent adjustability to account for lighting conditions and personal preferences. The only difference is the solar cell panel on the 507c, providing a supplemental power source.

What are the warranty terms for Holosun 507c and 507k?

Holosun provides a 10-year limited warranty covering defects in materials and workmanship for the illumination system and a lifetime limited warranty covering defects for the housing and electronics. This strong coverage demonstrates Holosun’s proven reliability and confidence in their optics.

Conclusion and Recommendation

So there you have my complete breakdown of how the Holosun 507c and 507k compare across critical criteria for pistol optics. Based on my detailed testing and comparisons, here are my final recommendations:

For full-size and tactical pistols, I recommend the Holosun 507c. The larger viewing window provides better target visibility and acquisition, especially at speed. Superior durability with thicker aluminum housing also gives it an edge for duty or defensive use. And the solar power cell ensures the optic is never inactive when you need it.

On the other hand, for subcompact concealed carry pistols, I suggest the Holosun 507k. It’s incredibly lightweight and low-profile so it won’t weigh down your EDC. The streamlined mounting options are optimized for small-frame pistols. And the integrated rear backup sights provide redundancy if your dot goes down.

While both optics are extremely capable, choosing the one tailored to your specific pistol size and shooting needs will provide the best performance and usability. For most users, I don’t find the $10-20 price difference to be a key factor given the parity in value. Make your selection based on how well each Holosun model complements your individual requirements.

I’m confident you’ll be more than satisfied with either the 507c or 507k. Holosun has hit it out of the park with these rugged, high-performance, feature-packed pistol optics priced for the everyday user. Whichever you select, enjoy the upgrades in speed, accuracy, and capability your new Holosun sight provides. You can bet I’ll keep relying on mine for all types of shooting adventures to come!

About the author

The name's Chris. Just a regular dude who loves firearms. I've been shooting since I was a kid. My old man taught me the ropes.

I'll never forget the first time I missed an easy shot on a buck, thanks to a bum scope. The image was fuzzier than my dog's butt. After that, I got obsessed with understanding scopes. What makes the good ones tick and the bad ones trash. After a few years and a few thousand bucks, I learned what separates the winners from the losers. Once I had a good stockpile of knowledge, I launched this site.

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