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  • Post last modified:August 13, 2023

In this guide, we take a look at Holosun 507C VS 509T comparison side by side to help buyers make a purchase decision on these two popular products.

This review guide aims to get a base line impression of the optic's overall range performance without intentionally torture test them in impossible situations. I have tested multiple red dot sight optics in the past to judge if they are good for duty carry or just for the range. 

Holosun 509T's enclosed emitter design is unique and its very promising. Let's see what we like and don't like about each optic.

Holosun 507C VS 509T Comparison - Core Differences

Holosun 507C X2 Specs

holosun 509t vs 507c durability
  • Magnification - 1X
  • Reticle - 2 MOA,  32 MOA Ring, or combined
  • Adjustment - 1 MOA / Click
  • Brightness - 10 DL&2 NV (Features Lockout Mode)
  • Construction - Grade 5 7075 T6
  • Submersion - IP67
  • Window Size - 0.63" X 0.91"
  • Body Dimension - 1.78" X 1.15" X 1.15"
  • Weight - 1.5 oz
  • Battery - CR1632
  • Battery Life - 50,000 hours + Solar

Holosun 507C review


  • Battery life of over 50,000 hours with fail-safe solar backup
  • Utilizes RMR footprint
  • Motion-activated reticle to conserve battery life
  • Multiple reticle options with lockout mode to prevent unintentional adjustments
  • Side battery tray access for easy replacement without removing the sight
  • Comparable durability to Trijicon RMR, but more affordable
  • Cons

    • Need a tiny flat head screw driver to dial the turret in the field
    • Open emitter design attracts dirt

    Holosun 509T X2 Specs

    holosun 509t on walther pdp 9mm
    • Magnification - 1X
    • Reticle - 2 MOA + 32 MOA Ring, or 2 MOA dot
    • Adjustment - 1 MOA / Click
    • Brightness - 10 DL&2 NV (Features Lockout Mode)
    • Construction - Solid titanium body
    • Submersion - IP67
    • Window Size - 0.63" X 0.91"
    • Body Dimension - 1.6" X 1.16" X 1.13"
    • Weight - 1.72 oz
    • Battery - CR1632
    • Battery Life - 50,000 hours + Solar

    Holosun 509T review


    • Its fully enclosed body design prevents debris from entering and safeguards the emitter projection.
    • It includes all the same features as the original 507C.
    • ACSS reticle available (Sold separately)
    • The latest version features a new clamp mount for easy installation.
    • The Holosun logo has been blacked out, which appeals to some customers.
    • Additionally, it is considerably more cost-effective than the Aimpoint ACRO.


    • Needs a new optic plate adapter to fit
    • Flat top hood design may concentrate stress onto the corner then onto the lens
    • Field of view edge distortion

    Size & Weight Comparison

    holosun 509t vs 507c top view
    holosun 509t vs 507c side view

    Holosun 507C X2 and 509T X2 share similar body dimensions in terms of width and height, the 507C is slightly longer than 509T but not by much.

    507C weighs 1.5 oz

    509T weighs 1.72 oz


    After using the Holosun 507C for an extended period, we can confirm that it is just as durable as the RMR, provided that it is used under normal conditions.

    Furthermore, to demonstrate its robustness, we conducted a series of tests without intentionally or directly damaging the optic's glass.

    shooting sig p320 with holosun 507c

    These tests included sliding the firearm against various surfaces, dropping it straight down from shoulder height, and casually dropping the gun at an angle while the optic was attached. Despite these harsh conditions, the Holosun 507C's emitter remained intact and fully functional. Other rough handling tests include

    • Hard slide rack against surfaces
    • Scrapping the optic across the ground to clear malfunction
    • Casually drop the gun with the optic on it at an angle 
    holosun 509t buried in snow

    The Holosun 509T 's closed emitter design definitely does what it supposed to do to keep water, dust and mud away from the emitter.

    That is the biggest advantage for choosing the Holosun 509T has over the Holosun 507C in this regard.

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    Glass Clarity

    The 509T has a slight 1.1X magnification. It's not too distracting, but it can throw some users off if they are not used to it.

    The 507C features two reticle systems:

    • 32 MOA + 2 MOA dot reticle
    • ACSS Vulcan reticle (Faster to acquire if lost in the window, only in ACSS model)
    acss vulcan reticle pov
    holosun 507c x2 vs 509t glass clarity

    Glass clarity is good for both optics. However, the 509T does a way better job in windy outdoor conditions with sand blowing around, thanks to that enclosed body design to keep out debris.

    holosun 509t vs 507c on pistols pov

    When the 507C gets dirty, the user typically has to wipe the front lens and then dig the finger or q tip into the emitter pocket to clean things out.

    Read more pros and cons of Open vs Closed emitter red dot sights here

    Mounting Options

    The Holosun 507C is compatible with all slides or optic mounts that use the RMR footprint. If the mounting platform has sufficient screw depth, longer screws will provide better security for the optic compared to short screws.

    507c vs 509t footprint

    The Holosun 509T utilizes a clamp mount, which offers improved alignment tolerance and a built-in recoil lug that ensures a secure fit.

    However, before purchasing the 509T, it is crucial to verify that your pistol slide is compatible, as you may need to purchase an aftermarket plate. Since the 509T's mounting footprint is relatively new, several handguns require specialized customization to accommodate it, which may push buyers away.

    walther pdp chpws 509t plate
    holosun 509t on rmr plate

    A nice thing about the Holosun 509T is that it comes with an RMR adapter plate, so users can mount the Holosun 509T on any pistol slides already fitted for the Trijicon RMR.

    Reticle Differences

    Both optics feature the same multi-reticle system.

    The user can cycle between on the Trijicon 507C X2:

    32 moa ring only 507c
    • 2 MOA center dot only
    • 2 MOA center dot + 32 MOA ring
    • 32 MOA ring only
    • ACSS Vulcan reticle (ACSS model only)

    The Holosun 509T only features

    holosun 509t pov 32 moa ring reticle
    • 2 MOA center dot only
    • 2 MOA center dot + 32 MOA ring

    Note: Shooters with astigmatism may need vision correction to see a crisp dot.

    When it comes to fast target acquisition, turning on the 32 MOA ring helps a lot for CQB applications and can also be used as a shotgun reticle.

    fnx45 with holosun 507c pov

    The core difference is that the 509T features a 0.5 MOA / Click adjustment while the Holosun 507C only feature 1 MOA / Click adjustment.

    Many times in our field tests, we've gotten lost in the zero because we were using the wrong click value in our calculation. 

    Be sure to memorize this when you are on the range zeoring the sight.

    Quick turret adjustment formula: 

    Number of clicks to adjust = How much missed (inches) / Yard(1/100th) / Click value

    For pistol applications, both optics work. As far as rifle applications go, the 509T offers finer adjustment for PCC and centerfire rifles.

    Battery Life

    507c vs 509t

    Both optics feature long battery life using 1 CR1632 lithium battery. 50K - 100K hours is a long time at setting 6.

    The user can access the battery via the side tray, which eliminate the need to remove the optic off the mount or slide to swap battery.

    For users that switch battery every 365 days, the 50,000 hours is plenty, and it's at the industry standard.

    No re-zero or re-torquing required

    Both optics offer 12 day light settings, and the user can save the settings so nothing can accidently throw off the reticle brightness.

    holosun 509t and 507c battery trays

    Solar fail-safe acts almost like a fiber optic to collect light to keep the optic working even if the battery is removed.

    The motion sensor feature is great to save the battery even more.


  • Holosun 509T offers better weatherproofing and protection against debris with its enclosed emitter design, while the 507C has an open emitter design that is more prone to dirt.
  • Both the Holosun 507C and 509T have multiple reticle options, but the 507C has an additional ACSS Vulcan reticle option available in the ACSS model.
  • Both models are durable and have similar construction materials, with the 507C made of Grade 5 7075 T6 and the 509T featuring a solid titanium body.
  • Both models have the same IP67 submersion rating, but the 509T is slightly heavier at 1.72 oz compared to the 507C at 1.5 oz.
  • Both optics have a battery life of 50,000 hours with solar backup.