HexCap™ — Snap-Fit Kill Flash / Anti-Reflection Device for Red Dot Sights
The HexCap™ is our original invention — a rugged, snap-fit killflash-style anti-reflection device (ARD) engineered to eliminate optic glare and protect your lens. Each HexCap™ is precision-fit for specific red dot sight models from leading brands like EOTech, Trijicon, Vortex, Primary Arms, Aimpoint, Sig Sauer, Holosun, Leupold, and Steiner.
In the 7 S’s of camouflage, shine is one of the fastest ways to compromise your position. The lens of your optic is often the brightest, most reflective surface on your kit — and even a split-second glint can give you away.
This isn’t theory. From WWII through modern combat, countless soldiers and snipers have been spotted — and sometimes killed — because of reflections off their scopes. The HexCap™ was created to solve that problem. Its hexagonal honeycomb structure breaks up reflections while preserving a clear sight picture, giving you both concealment and lens protection in one low-profile, field-ready package.
Unlike most OEM and imitation ARD's, the HexCap™ is lighter, tougher, and built for field use. It protects your glass from scratches, dirt, and debris while reducing signature — trusted by professionals, hunters, and serious shooters worldwide.
HexCap Compatibility List
Aimpoint
9000L – Macro
9000SC – Macro
ACO – Macro
ACRO C-2 – AP2
ACRO P-2 – AP2
CompC3 – Macro
CompM2 – Macro
CompM4 – Macro
CompM4S – Macro
CompM5 – Micro
Duty RDS – Micro
H1 – Micro
H2 – Micro
M68 – Macro
PRO – Macro
T1 – Micro
T2 – Micro
EOTech
XPS – XPS
512 – XPS
EXPS – EXPS
EFLX – EFLX
518 – EXPS
Holosun
403R – 403R
403B – 403B
403C – Micro
407C – 507C
407K – 507K
503C – 503C
507C – 507C
507Comp – 507Comp
507K – 507K
508T – 508T
509T – 509T
510C – 510C
ARO EVO – ARO EVO
AEMS – AEMS
EPS – EPS
EPS Carry – EPSC
SCRS – SCRS
Leupold
DPP – DPP
Primary Arms
SLx MD-21s – MD21
SLx MD-21s – MD21
Sig Sauer
Romeo5XDR Gen 1 – R5XDR
Romeo 5 Gen 2 – R5G2
Romeo 5X Gen 2 – R5XG2
Steiner
MPS – MPS
Trijicon
RMR – RMR
RMR cc – RMR cc
RMR HD – RMR HD
SRO – SRO
RCR – RCR
MRO – MRO
MRO SD – MRO
MRO HD – MRO
TA01 – TA31
TA02 – TA02
TA11 – TA11
TA31 – TA31
TA110 – TA11
Vortex
AMG UH-1 – UH-1
Defender CCW – DEFCCW
Defender ST – DEFST
Defender XL – DEFXL
Viper – Viper
Shipping & Delivery
Free Shipping
All domestic orders qualify for free First Class Shipping on all orders over $80.
Delivery Times
Items usually arrive within 3-5 days of purchase. You will receive an email from us once your package has shipped with a tracking number and a link to track directly.
International Shipping
Although we are based in the USA, we can also ship to the countries within the European Union.
Real-world results. See how our gear holds up in the field—straight from the people who rely on it.
Customer Reviews
Overall rating: 4.6 / 5 from 462 reviews.
The quality is just not up to par. You guys need to be using stronger materials. I understand you guys are a veteran owned company, which is the most upsetting part due to the lack of quality in the product that is supposed to be used in conditions when you don’t want your optic to be reflecting, light and giving away your position.
I purchased a honeycomb for my Trijicon, SRO and 3.5x acog. As a veteran myself, I do a lot of training, and I am not gentle with my tools at all. Still, I expected more from this product, especially when neither of the honeycombs were damaged from direct impact to the honeycombs just from reverberation.
I have purchased several OHC covers and kill flash attachments and love them all. A little pricey but worth it.
Fit, function, and durability is exceptional. If you have an optic and need a lens cover or kill flash, OHC likely has you covered…if they haven’t made it yet, check with them and it maybe in the works. Totally satisfied with my recent purchases: Trijicon RMR and Aimpoint Micro kill flashes.
I like the cover. Haven’t had a chance to shoot out in the sun yet but I normally get some glare in my basement while dry firing and it’s not there now. I’m happy with the fit on my Holosun 507 Comp too.
I haven’t had the chance to test it in real-world conditions yet, but I have no doubt about its high effectiveness.
Furthermore, the HexCap Killflash is a very well finished product that perfectly fits the EOTech EXPS3-4 HWS Red Dot Sight.
Hundred Kudos to One Hundred Concepts for this brilliant device!
I have purchased a couple hex caps here and they are great quality.. they fit perfectly. Will purchase more for sure.. the shipping on second purchases took a bit longer but that was strictly the USPS mishap, nothing to do with company.
I am a little disappointed as I have reached out by both direct email as well as the contact feature on the website and have not heard back. Overall the product is good, but I think my specific unit is defective. It seems to not be fully printed in the upper part of the hex. It also does not stay in place on the optic and is very wobbly. I do not have confidence it would stay on if dropped. I really hate giving negative review and would be happy to update if/when my concerns are addressed.
Great product it fit exactly the way it was designed to but if you have optic stickers as shown in the picture it will shift them every so slightly but nothing that will be noticeable so if you are thinking about getting one I’d recommend it 100%
I was actually pleasantly surprised at how solidly the cap clicked into place! Definitely a worthwhile purchase! The manufacturing texture and fitment is perfect. Now make one for a Holosun ARO EVO, please!
It seems to fit tightly on my ACRO. It’s durable and well-made. I’ve been wearing it for a couple of weeks and it has not moved or felt as if it would come off. One more piece of quality gear..
This ard actually locks on to the rmr sight through the pass through hole in the base of the rmr. Its a solid unit i definetly recomend it for sure. Oh and it blocks reflections.
I have my Holosun 507c piggyback mounted to a Primary Arms 5x Microprism with a killflash. So I wanted one for the Holosun also. It fits and works well. I don’t see tj hex grid when I am looking at a target and this protects my red dot and reduces glare.
No darkness added to the view, enough depth to effectively stop glare in nearly any angle or position, and on the TA31 it indexes perfectly into the lower hole to guide and clips on wonderfully to the ridge. I truly believe it would break before accidentally leaving the sight. And I'm not calling it weak!
Quality control is lacking, product has several cracks, and is loose fitting compared to 407 model.
A replacement is definitely in order, as well as better engineering.
Second RCR killflash I’ve purchased for my 2nd RCR, which I put on my MPX. Mounts easily and comes off easily as well whenever I need to take it off. Hex pattern has some pretty good depth to it.
Slick, sturdy, and easy to install. Perfect addition to my RCR which I have piggybacked on an NX8 1-8x24. Since I have the RCR mounted so high I wanted something to kill any glare off the glass and this fits perfectly.
Great product would be a lot better if it came with a retention system to keep it snug to the optic, like how the honeycomb is on the RCO.
Edit: the quality of this product is just not made to last. Whether you’re spending long days in the sun or in a colder environment. Whatever they use to 3-D print the honeycomb’s it’s just not up to par. Unfortunately in the photo is not from 100 concepts. It’s actually from Trijicon.
My second one. Put them on both my top mounted RMRs on my 556 and 308 ARs. They look badass, fit tight with no slop, and work to kill the dot glare well.
Was worried about the honeycomb pattern on such a small window, but the EPS Carry HexCap is engineered perfectly.
• The View: Once you’re focused on the target, the hex pattern disappears completely.
• The Fit: Snug enough that I don't worry about it popping off during training, but easy to remove if I need to deep-clean the glass.
• Signature: Effectively kills that 'flat glass' reflection.
I’ve bought three of these for various optics now, and the quality is consistently top-tier.
A good friend of mine suggested I take a look at these scope caps. He bought me one for my birthday for my Eotech 1-10 VUDU. Love it. I can see clearly with it on. Does not obstruct my view even out at 500m+. I decided to throw one on the Eotech epxs3. I’m able to pickup my sight and put rounds on target just as fast as without it. I’m probably going to put one hundred concepts on the rest of my optics and lights.
I like how rugged it is, how reliable it is. I have not had any issues. And I am so glad that I purchased 3 of them from aim points. So I look forward to buying more products from you guys. And what you have in the future
All Caps
ScopeCaps
LightCaps
Red Dot Caps
Night Vision Caps
Thermal Caps
Specialty Caps
Lights
Red Dots/HWS
Magnified Optics
Lasers
Slings
Night Vision Devices
Thermal
Helmets
Accessories
Camouflage
Water
Faraday
EDC
Apparel
