In this post, we’re comparing two concealed carry enclosed-style pistol optics: Holosun EPS Carry vs SIG Romeo X Enclosed Compact. Let’s cut to the chase.
| EPS CARRY | ROMEO X ENCL COMP | |
| Footprint | K (modified RMSc) | RMSc |
| Housing | 7075-T6 Aluminum | 7075-T6 Aluminum |
| Deck | 6.16 mm | 6.09 mm |
| Dimensions (LxWxH), in | 1.62 x 1.07 x 0.95 | 1.62 x 1.23 x 0.94 |
| Window | 0.77″ x 0.58″ | 0.81″ x 0.62″ |
| Weight | 1.23 oz | 1.1 oz |
| Battery type | CR1620 | CR1632 |
| Battery life | 50k hours | 20k hours |
| Battery Cap | Screw tray | Threaded |
| Brightness | 15 (12 DL, 3 NV) | 12 (8 DL, 4 NV) |
| Auto-Brightness | Yes (MRS only) | No |
| IP Rating | IPX8 | IPX7 |
| Reticles | 2 MOA, 6 MOA, MRS | 3 MOA, 6 MOA, Circle dot |
| Reticle color | Red, Green | Red, Green |
| Price | $273-$430 | $430-$499 |
| Variants | Black | Black, FDE (Circle dot only) |
Footprint and Fit
The Romeo X Enclosed Compact is built on the Shield RMSc footprint. If you have a P365 series pistol (or any other pistols with the RMSc slide cut, like the Glock 43X MOS or Springfield Hellcat Pro), this thing is pretty much a direct drop-on for it. No plates, no gaps.
The EPS Carry uses the Holosun K footprint, a so-called modified Shield RMSc. While many slides accept it directly, depending on your specific recoil lugs, you might need the included RMSc adapter plate or a filler plate.
EPS Carry will mount directly on P365/P365X series, Ruger Max-9, S&W Equalizer, and FN Reflex MRD without adapters. But guns that have the full RMSc post configuration require the included RMSc-to-K adapter plate for mounting the Holosun.
Comparing how low both optics sit on the slide, the RomeoX Enclosed Compact wins – it’s deck height is 6.09mm compared to EPS Carry being 6.16mm.
So if you want your optic that sits as low as possible and fits the RMSc slide cut directly, the Romeo X is what you need, especially if you own a SIG. However, with the Holosun EPS Carry, you can often get a “lower 1/3” or “combat hold” co-witness.
Glass and Lens
Generally speaking, both pistol optics have excellent glass quality (both use the aspherical glass lens). However, there are nuances. Holosun glass is known for a slight bit of edge distortion (some call it the “coke bottle” effect). It’s not a dealbreaker for a carry gun, but it’s there. On the other hand, the glass on the Romeo X is generally praised for being slightly clearer with less tint and less edge distortion.
The window size on the RomeoX is larger, being 0.81″ wide and 0.62″ tall. The EPS Carry window size is 0.77″ wide and 0.58″ tall.
Reticles
At the time of the post, both EPS Carry and Romeo X Enclosed Compact offer several reticle options in red AND green. But for a long time, the EPS Carry was the most versatile pistol optic series in the market, offering the best green dot sight for the price.
Here are your reticle options with both series:
Holosun EPS Carry
- Reticle Options: 2 MOA dot, 6 MOA dot, MRS (2 MOA dot + 32 MOA circle)
- Colors: Red, Green
SIG Romeo X Enclosed Compact
- Reticle Options: 3 MOA dot, 6 MOA dot, Circle Dot (2 MOA dot + 32 MOA circle)
- Colors: Red, Green
The basic reticle in the EPS Carry is a 2 MOA dot. In the RomeoX, it’s a 3 MOA dot. A larger dot is easier to pick up, while a smaller dot blocks less of the target. For concealed carry setups, a larger dot might be a better option.
Durability and Housing Materials
Let’s talk about the origin. The Holosun EPS Carry is made in China. We know that bothers some of you. However, Holosun has earned a reputation for being nearly bombproof. The EPS Carry is made of 7075 T6 Aluminum and has an IPX8 waterproof rating (you can submerge it beyond a meter). It has a proven track record of good recoil management.
The SIG Romeo X is “Assembled in the USA.” It uses parts from overseas (likely similar sources to Holosun for electronics), but final assembly happens stateside. It’s also 7075 Aluminum, but it’s rated IPX7 (1 meter submersion for 30 mins).
Also, the SIG pistol optic uses a Beryllium Copper flexure arm that significantly improves durability compared to standard designs, replacing springs inside.
Both of these are fully enclosed. If you carry IWB, this is mandatory. Open emitters turn into lint buckets in about three days.
Battery
The Holosun EPS Carry uses a CR1620 battery, which is slightly less common in red dots than a CR1632 used in the SIG RomeoX Enclosed Compact. It claims 50,000 hours of battery life. The “Solar Failsafe” on the MRS models is a nice backup, but don’t rely on it as a primary power source.
The SIG is rated for 20,000 hours. It’s less than Holosun pistol optic, but still plenty if you change it annually.
Controls
Both optics use side-mounted buttons for manipulating brightness and reticles. The buttons on the EPS Carry are larger and, thus, are easier to find and press, especially with gloves or in low light. That’s an advantage if you have big fingers. However, being more exposed means they are easier to press unintentionally.
The RomeoX uses smaller, rubberized side buttons that sit more flush and appear more captured by the optic body, making them less snag‑prone and less likely to be accidentally pressed in holsters or on surfaces.
If you want controls that are more holster‑friendly, the RomeoX design is preferable, with the tradeoff that the smaller, recessed buttons are slightly less “positive” to index and press under stress.
Auto-Brightness and Sensors
The RomeoX Enclosed Compact has NO auto-brightness sensor – only manual brightness control via UP/DOWN buttons with 15 settings (12 DL, 3 NV). It features MOTAC (Motion Activated Illumination) that powers on with motion and powers off after 2 minutes of inactivity.
The Holosun EPS Carry MRS version has the auto-brightness feature along with the manual brightness adjustment mode with 12 settings (8 DL, 4 NV). The auto-brightness feature is hit-or-miss since the sensor is located on the top of the unit; it often washes out if you are in a dark room aiming into a bright area. While most users turn auto-brightness off immediately, those who carry in bright climates and do not rely heavily on WMLs find auto mode good enough, as the unit can run from solar in many conditions and saves battery when ambient light is strong.
All Holosun EPS Carry models feature Shake Awake technology that auto-deactivates after 10 minutes (default), with adjustable sleep timer options of 1 hour, 12 hours, or always-on.
Built-In Rear Sight
Reviews of the open Romeo X mention built-in fiber optic rear sight. Note that the Enclosed Compact version lacks it because housing takes up that space. However, because the deck is so low, you are meant to use the gun’s actual rear sights (if your slide cut retains them). The EPS Carry has a rudimentary “notch” cut into the back of the housing to act as an emergency rear sight, but it’s pretty useless for precision.
Price
You can usually find a Holosun EPS Carry (Red, non-MRS) hovering around the $330-$350 mark, with the Green MRS models pushing $430+.
The SIG Romeo X Enclosed Compact is more of a premium sight. You are looking at roughly $480-$500.
Final Thoughts
Both are excellent. You honestly can’t go wrong, but for the money, the EPS Carry still holds the title for pure value and versatility. If you have a SIG pistol or are willing to spend a bit more, the Romeo X might offer a feature set that suits your needs a bit better.
