Holosun 507 Comp – A Big Improvement

Estimated reading time: 7 minutes

Holoson is well known for its 507/407 line like the 507C.  I never liked the reticle and the lens was a bit too small to be ideal.  The new 507 Comp improves both in a great way.  Bigger lens, bigger dots, and eight reticle choices.

Bigger is Better

I like big dots!  They are easier to pick up with the eye and easier to see during recoil and transitions.  In the standard 507 line from Holosun, I always preferred the discount version, the 407 CO.  While it is now discontinued, I thought it was the best reticle of all the reflex-style red dot sights (RDS) that Holosun made.  It featured the same housing and lens size as the 407C and 507C, but instead of a single 2 or 3moa dot and 32moa ring (507C only) it came with an 8 MOA donut.  Just a simple clean large ring.  I would have preferred a large dot, but the ring was the next best choice.

The other limiting factor of the standard 507/407 was the lens size.  While not tiny it was still pretty small.  The smaller a lens is vertically, the easier it is for the dot to move off the lens under recoil.  A wider lens makes it easier to see the dot on the lens if your gun is not straight ahead on the draw, a common problem with newer dot shooters.

Enter the 507 Comp, more reticle options, and a bigger and taller lens.  This optic is primarily intended for use on a pistol, specifically a competition pistol.  It features an RMR footprint (same as the standard 507) which is the most common footprint for optics on a pistol.

You Don’t Need A Small Dot For Precision

But Muh Precision!  A common statement by the small dot nerds.  You don’t need a 2moa dot to hit the A zone of a USPSA target at 25, or 50 yards.  I shot USPSA for over a decade with a 10 MOA Aimpoint tube.  A lot of those matches included 50-yard standards stages.  A 10 MOA dot covers 10 inches at 100 yards.  It covers 5 inches at 50 Yards.  A USPSA A zone is 6 inches wide, so the dot won’t cover the A zone and you can still hit it at 50 yards – and it is that much faster at closer distances.

CRS – Competition Reticle System

The 507 Comp has a very large lens, as wide as a Romeo3 XL and about as tall as an SRO.  With that large lens, you have many reticle choices. 2 moa dot, 8 moa circle, 20 moa circle, and 32 moa circle.  The dot can be used with any size circle or just the circle, giving you 8 different reticle options.  To switch the reticle you just hold the minus button for a couple of seconds. 

507 Comp Testing

I’ve been testing the 507 Comp in competition on a Glock 45 MOS for over 6 months.  The Competition Reticle System is a big advantage in that you can switch reticles between stages.  On a stage with a fair amount of 20+ yard targets, I will use the 8 moa circle and dot.  On a stage like Smoke and Hope with 18×32 inch steel rectangles at 7 yards I use the 20 moa circle and dot.  I do not use the dot or 32 moa circle alone; for me the dot is too small and the circle too big. 

In head-to-head testing, I was generally faster on target, with follow-up shots and in transitions with the 507 Comp vs the 407 CO even when just using the 8 moa circle on the Comp.  The larger lens makes a difference under recoil and movement.

After all this testing, I like the 507 Comp and I would not hesitate to use one on a carry gun like a Glock 17 or 19.  I have carried my G45 with the 507 Comp as well.  While the lens is much larger to the eye, the housing does not feel significantly larger to me when carrying.  I would not consider the 507 Comp appropriate for smaller pistols like a G43x or P365.  It would be much wider than the slide and the RMSc footprint to RMR adapter plates are a bit clunky.

The rest of the 507 Comp has all the features you are used to with Holosun.  It comes in both red and green, coated glass, 7075 T6 aluminum, IP87 waterproofing, shake awake, up to 50k hours of battery life, and all the other standard stuff. 

507 Comp vs 507C Size

The main differences in specs are the weight and window size.  The Comp weighs 1.7 oz and the 507C 1.5 oz.  The Comp window is 1.1 x .87 inches and the 507C is .63 x .91 inches.  The area for the Comp is .957 sq inches while the 507C is .5733 sq inches.  The 507C housing is 1.78 x 1.15 x 1.15. The 507 Comp has a larger housing at 1.8 x 1.3 x 1.3. The Comp window is just under 70% larger than the 507C.  The Comp only has 8 brightness settings (2 NV, 6 DL) vs the 12 settings (2 NV, 12 DL) for the C.

I like the 507 Comp. It is a contender that can hang with other popular comp optics like the Romeo3 XL, SRO, and STS2.  There are two things I did not like.  I would prefer if the 8, 20, and 32 moa circles were closed.  All three have a small gap at the bottom 6 o’clock position.  I would also prefer a larger 4-6 moa dot instead of the 2 moa.  Ideally, I would want a 6 moa dot with 12, 18, and 24 moa circles.

READ MORE: Testing Holosun’s Titanium 3X Magnifier

All in all, it is a solid choice for competition or carry (on an appropriate-sized pistol).  Large lens, 8 reticle choices, good battery life, and reasonably priced at $435 MSRP and a common street price of $369.

507 Comp Specs:

OPTICAL SPECS
Reticle	2 MOA Dot & 8/20/32 MOA Circle
Light Wavelength	650nm
Reticle Color	Red
Parallax Free	Yes
Unlimited Eye Relief	Yes
Magnification	1x
Multi-Coatings	Yes
PHYSICAL SPECS
Window Size	1.1×0.87
Dimension (in)	1.8×1.3×1.3
Weight (oz)	1.7
MECHANICAL SPECS
Housing Material	7075 T6 Aluminum
Surface Finish	Anodize
Adjustment per Click	1 MOA
W&E Travel Range	±30 MOA
ENVIRONMENT SPECS
Storage Temperature	-40℃~70℃
Working Temperature	-30℃~60℃
Submersion	IP67
Vibration	5000G

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