If you’re looking to upgrade your concealed carry pistol with a reliable and high-performance optic, Holosun Red Dot with RMSC Footprint are among the top choices currently.
Known for their rugged durability, innovative features like Shake Awake, Multi-Reticle Systems (MRS), and enclosed emitters, Holosun optics deliver premium performance without the premium price tag. Whether you’re a first-time red dot user or a seasoned shooter, these optics offer faster target acquisition, improved accuracy, and rock-solid reliability in all conditions.
This guide covers the best Holosun RMSc-compatible red dot sights, including key specs, pros and cons, mounting tips, and model comparisons.
From the simple and affordable 407K X2 to the ultra-durable EPS Carry MRS, we’ve broken down everything you need to make an informed buying decision.
If you’re ready to upgrade your EDC setup, scroll down to find the perfect Holosun optic for your RMSc-cut pistol and shop with confidence through our trusted affiliate links.
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| 1)Holosun 407K X2 (6 MOA dot) |  |
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| 2) Holosun 507K X2 (2 MOA dot + 32 MOA circle) |  |
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| 3) Holosun 507K X2 ACSS Vulcan |  |
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| 4) Holosun EPS Carry MRS |  |
What Is an RMSc Footprint and Why It Matters for Red Dots?
RMSc footprint mounting standard The RMSc footprint is a mounting standard designed originally around the Shield RMSc (Reflex Mini Sight Compact) red dot. Since then it has grown to become one of the most prevalent optics footprints in micro-compact pistols specifically meant to be concealed carryish such as the SIG Sauer P365, Springfield Hellcat, and Glock 43X/48 MOS.
What is RMSc Footprint?
The collection of RMSc footprints includes:
- Two recoil lugs (positioned at the front and the back)
- There are two mounting holes that are spaced about 1.15 inches apart
- A reduced optic base with full size RMR or Docter type footprints
In comparison with larger red dot mounting systems, RMSc is slimmer and low profile, permitting red dots to low profile on pistols with limited slide real estate.
Why the RMSc Footprint matters
- The weapon is also compatible with the concealed carry.
The majority of RMSc-footprint optics are made to fit micro-compact pistols and are therefore lighter, more easy to conceal and excel in every-day carry (EDC).
- Low Deck Height to Co-Witness
RMSc optics such as the Holosun 407K/507K or EPS Carry are also low enough that they may co-witness with standard iron sights, so that taller suppressor iron sights are not required.
- Slide Cut Matching
Pistols that are described to be optics-ready usually mention RMSc compatibility. Secure mounting, without having to use additional adapters or bridge the gun can be obtained by simply red dot of the correct footprint using the corresponding footprint of the same size.
- Growing Ecosystem
Due to an increasing number of optics work with RMSc base, gunmen enjoy an expanded range of red dots that offer high UX parameters, such as the Holosun 507K X2, EPS Carry MRS, and Swampfox Sentinel.
Benefits of Using a Red Dot Sight on a Micro-Compact Pistol
- More Rapid Target Acquisition
The red dots abolish the necessity to adjust front and rear sights. In place of this you merely drop the dot on to the target then shoot. This is much quicker, particularly when there are pressures or when there is dynamic activity.
- Improved Accuracy
A red point indicates your point of impact, and thus decreases errors in aiming as a result of sloppy sight position. It is particularly useful at a longer range, where conventional irons on small pistols are hard to manipulate accurately.
- Better Low-Light Performance
Micro red dots are lit up and they can easily be detected in low light conditions than the traditional iron sight. They have adjustable brightness or night vision modes on most of them to enhance their performance in the case of defense.
- Easier for Aging or Impaired Eyes
In case of shooters having visibility problems, red dots prove to be a game changer. There is no need to concentrate on three planes (rear sight, front sight, target) but only on the dot and on the target. It makes the visual work easy.
- Higher Level of Situational Awareness
When you shoot with a red dot, you can have both-eyes-open aiming or shooting which provides you with a larger field of view and much better situational awareness which is vital in a self-defense scenario.
- Enhanced Confidence & Training Feedback
You can look at where your dot goes when you break the shot which can then help diagnose trigger control or grip. It is a very good teaching tool and over time, develops the skills and confidence.
How to Mount Holosun Red Dots on RMSc-Cut Slides
Here’s a step-by-step guide with important tips:
Step 1: Confirm Footprint Compatibility
- Holosun optics like the 407K/507K X2 and EPS Carry use a modified RMSc (K-series) footprint.
- Most pistols labeled “RMSc-ready” (e.g., SIG P365 XL, Springfield Hellcat, Glock 43X/48 MOS) are compatiblebut check for screw depth, spacing, and post alignment.
Good news: Most Holosun red dots ship with screws, and some come with adapter plates for better fitment.
Step 2: Prep the Slide and Optic
- Unload the firearm and clear the workspace.
- Remove the optic cover plate (if present) and clean the mounting surface of oil or debris.
- Use a threadlocker like Blue Loctite (non-permanent) on the optic screws for secure mounting.
Step 3: Install the Red Dot
- Align the optic over the mounting holes.
- Insert the correct-length screws (included with most Holosun optics).
- Torque to spec: Generally around 10–15 in-lbs (consult your pistol and optic manual).
DO NOT overtighten this can strip threads or damage the optic.
Step 4: Test Fit and Co-Witness (Optional)
- Once mounted, check iron sight co-witness if desired.
- Some Holosun optics (like the 507K) allow co-witness with standard-height sights due to their low deck height.
Step 5: Function Check
- Rack the slide and dry fire to ensure the optic stays in place.
- Check for battery access (EPS and 507K have side-loading trays) so the optic doesn’t need to beremoved later.
What’s the difference between the 407K, 507K, and EPS Carry?
| Model | Reticle | Emitter Style | Best For |
| 407K X2 | 6 MOA dot | Open | Simplicity, fast dot |
| 507K X2 | 2 MOA dot + 32 MOA circle | Open | Versatility |
| 507K ACSS | 3 MOA dot + 230 MOA ring | Open | Dot recovery help |
| EPS Carry MRS | 2 MOA dot, 32 MOA circle, or both | Enclosed | Ultimate durability |
Holosun Red Dot with RMSC Footprint
1)Holosun 407K X2 (6 MOA dot)
Holosun HS407k X2 is the best-rated micro red dot optic that fits ultra small handguns with the footprint of RMSc and thus is a perfect upgrade of pistols such as SIG Sauer P365, Springfield Hellcat, and Glock 43X/48 MOS.
Specifically designed in the concealed carry / everyday carry optic category it is a 6 MOA red dot which allows the user to read the red dot quickly and is easy to use, especially when shooting under high-stress situations or when the shooters have aging eyes.
407K X2 has been manufactured using 7075-T6 aluminum and thus is light, as well as durable. It also has Shake Awake technology that can activate the optic when motion is detected and switch the device down when not in use which can last up to 50,000 hours using a single CR1632 battery.
This is side-mounted battery with easy to replace battery without removing the optic. Its multi-coated glass offers a clear, straightforward sight view, and 12 brightness settings (and 2 night-vision-friendly) give flexibility in fluctuating light.
Co-witnessing Most pistols have standard-height iron sights, so the low deck height allows co-witnessing with the iron sights, which, in most cases, obviates the need to use suppressor-height sights. X2 has the provision of better lockout and button controls to avoid manual modifications when carrying it.
Key Specs
- Footprint: RMSc
- Reticle: 6 MOA red dot
- Battery Life: Up to 50,000 hours
- Battery Type: CR1632 (side-mounted)
- Brightness Settings: 12 (including 2 NV)
- Housing: 7075-T6 aluminum
- Water Resistance: IP67
- Weight: ~1 oz
Pros
- Compact and ultra-light
- Long battery life with Shake Awake
- Durable aluminum housing
- Clear glass and bright dot
- Side battery tray for easy swaps
Cons
- 6 MOA dot may be large for precision shooters
2) Holosun 507K X2 (2 MOA dot + 32 MOA circle)
Holosun 507K X2 is among the best red dot sights that one can buy with the RMSc footprint which is designed to fit into subcompact and micro-compact handguns with a special example being SIG P365, Springfield Hellcat, and Glock 43X/48 MOS.
The 507K X2 is famous with its Multi-Reticle System (MRS) which provides a choice between speed, precision or both with the use of a 2 MOA dot, a 32 MOA circle, or a circle-dot combination.
It was made to withstand day-to-day carry, recoil, and other abusive environments in a robust 7075-T6 aluminum chassis. It has the feature of Shake Awake technology that powers on the optic when in motion and saves battery when idle.
In conjunction with its side mounted CR1632 battery, this optic allows as much as 50,000 hours of battery life, based on use and setting level of brightness. The optic supports 12 levels of brightness; it has 2 night-vision compatibility options, so it will provide the best visibility in any light conditions.
The X2 includes a lockout mode so as to avoid accidental button presses when carrying concealed or holstering the X2. It can be co-witnessed with most standard size iron sights due to its low-profile construction and thus there is no need to use taller back-up sights.
Key Specs
- Footprint: RMSc
- Reticle: 2 MOA dot, 32 MOA circle, or both
- Battery Life: Up to 50,000 hours
- Battery Type: CR1632 (side-mounted)
- Brightness Settings: 12 (2 NV)
- Material: 7075-T6 aluminum
- Water Resistance: IP67
- Weight: ~1 oz
Pros
- Versatile multi-reticle system
- Durable and compact for concealed carry
- Long battery life with Shake Awake
- Side-loading battery tray
- Excellent clarity and brightness range
Cons
- Slightly pricier than 407K
3) Holosun 507K X2 ACSS Vulcan
The Holosun 507K X2 ACSS Vulcan is a refined micro red dot sight created to use on concealed carry pistols of RMSc (K-series) fit.
Designed in co-operation with Primary Arms, it incorporates the game-changing ACSS Vulcan reticle, increasing speed of aim and easy correction of alignment significantly, especially in novice shooters or in a high-stress situation.
This is the optic with 3 MOA center optic and a huge 230 MOA segmented circle. The outer ring becomes useful as your visual indicator, as when you are not centered, the ring comes in the line of sight, making you get centered by a quick check.
It is made of 7075-T6 aluminum which is not only lightweight but very durable. It is IP67 water and dust fetching, and has Shake Awake technology, which saves battery life by cutting power when the optic is idle and turning it back on again when it is shaking.
Also the battery of the unit is side-mounted CR1632 and the working time is up to 50,000 hours (with only a dot) or approximately 20,000 hours with the circle-dot enabled.
Key Specs
- Footprint: RMSc (modified for K-series)
- Reticle: 3 MOA dot + 230 MOA outer circle (ACSS Vulcan)
- Battery Life: ~50,000 hrs (dot only), ~20,000 hrs (circle+dot)
- Battery: CR1632, side-loaded
- Material: 7075-T6 aluminum
- Brightness: 12 settings (2 NV)
- Waterproof: IP67
- Weight: ~1 oz
Pros
- ACSS Vulcan reticle aids fast alignment
- Durable and compact
- Long battery life with Shake Awake
- Side battery tray
- Excellent for concealed carry pistols
Cons
- Outer ring reduces battery life
4) Holosun EPS Carry MRS
The Holosun EPS Carry MRS combines the svelte portability of micro red-dots and the tenacious construction of an enclosed emitter.
Fit to small-format slide models, such as the SIG P365, Glock 43X/48 MOS, Springfield Hellcat, and others, it introduces additional rigor and weatherproofing, which is intended to suit concealed carry.
Its most outstanding is the Multi-Reticle System (MRS): either one 2MOA wee dot, one 32MOA circle, or both rings and wee dots.
Circle-dot mode assists in ensuring alignment circle-dot mode makes helping with alignment Circle-dot mode means that when one is centered in, only the small dot can be seen, which gives quick acquisition as well as fine accuracy in aiming.
It also has Solar Failsafe (automatic brightness and solar panel battery backup), Shake Awake in power performance, and also a super bright LED (red or green).
Made with 7075-T6 aluminum making it ludicrously light, at only about 1 oz, and with a 1.62 1.07 0.95 2 inch footprint and 0.77 0.58 inch viewing window
Has 12 brightness settings (8 daylight, 4 compatible with night vision), and it is IPX8 waterproof, so it is rugged, stable and holster compatible
Key Specs
- Footprint: Modified RMSc (“K-series”) + included RMSc adapter
- Reticle: 2 MOA dot, 32 MOA circle, or dot+circle
- LED: Super LED, red or green
- Battery: CR1620 (side-load), Shake Awake
- Battery Life: 50k hrs (dot), 10k hrs (MRS circle+dot)
- Brightness: 12 settings (8 daylight, 4 NV)
- Material: 7075‑T6 aluminum
- Window: 0.77″ × 0.58″
- Size: 1.62″ × 1.07″ × 0.95″
- Weight: 1 oz
Pros
- Enclosed emitter: Resists debris and moisture—ideal for CCW
- Multi-reticle flexibility: Choose dot, circle, or combo on the fly
- Solar backup & auto-brightness in MRS model
- Long battery life with Shake Awake & side-loading ease
- Rugged yet compact via K‑series footprint with adapter plate
Cons
- Shorter battery life
How Choosing The Top-Rated Holosun Red Dot with RMSC Footprint
- Know Your Firearm’s Compatibility
First, make sure your pistol is RMSc-ready (also called “Shield footprint”). Common compatible models include:
- SIG Sauer P365, P365X/XL
- Glock 43X/48 MOS
- Springfield Hellcat, Hellcat Pro
- S&W Shield Plus Optics Ready
- Decide Between Open vs Enclosed Emitter
Open Emitter (e.g., 507K X2, 407K X2):
Lighter, smaller, and great for EDC or range use. More affordable.
Enclosed Emitter (e.g., EPS Carry, EPS Carry MRS):
Sealed design prevents dust, water, or lint interference ideal for everyday carry in real-world environments.
- Consider Battery Access & Life
All models use side-loading CR1632 or CR1620 batteries, so you don’t need to remove the optic for battery swaps.
Shake Awake & Solar Failsafe (on some models) extend battery life (up to 50,000 hours).
- Balance Budget vs Features
- Best Value: 407K X2 – Affordable and reliable
- Most Versatile: 507K X2 or EPS Carry MRS – Great mix of features
- Best for Beginners: 507K ACSS Vulcan – Helps find the dot quickly
- Most Durable: EPS Carry – Enclosed and rugged
FAQs
- Can I co-witness my iron sights with a Holosun red dot?
Yes, especially with the 407K and 507K, which have a low deck height. The EPS Carry sits slightly higher but still may co-witness depending on your iron sight height.
- Are Holosun red dots durable enough for daily concealed carry?
Absolutely. Especially models like the EPS Carry, which feature enclosed emitters, IPX7/IPX8 waterproofing, and 7075-T6 aluminum housings. They’re built to withstand recoil, sweat, debris, and daily wear.
- What does “RMSc footprint” mean?
The RMSc footprint comes from the Shield RMSc red dot and refers to a compact optic mounting pattern used on many micro-compact pistols. It features a narrow base, two screw holes, and two recoil lugs designed for small pistol slides.
Conclusion
The selection of the best Holosun red dot with the RMSc footprint may greatly improve your hidden carrying device. Holosun produces battle-tested design for micro-compact pistols, whether you want the minimalist speed of the 407K, the versatility of the 507K, or the durability of the EPS Carry MRS. Talk of these optics, they are more than hype as they meet standards on clarity, battery life and everyday durability.
Every model associated with our guide has been rated as a top model by shooters, trainers, and EDC fans alike, and it comes with a reputation of excellent quality that Holosun has to offer. I find that the Holosun K-series optics are one of the best optics you can put on a pistol that has an RMSc sight cut or you might want to put a cut on a pistol.
Want to take a step up in accuracy and speed? Use our affiliate links to to buy the best Holosun red dots at currently available best prices. The last accessory you need is just a single click away- you cannot afford to maintain the status quo by not upgrading your carry gun.
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