Holosun EPS Carry vs 507K: sealed emitter or circle-dot?
Our verdict: these two share a footprint and a window size, so the choice is what you want in front of the LED. Buy the EPS Carry (around $330, red) if you want an enclosed, IPX8 sealed emitter that lint and moisture cannot reach and an adapter plate in the box, and you are happy with a single fixed 2 or 6 MOA dot. Buy the HS507K X2 (around $300, red) if you want Holosun's selectable 2 MOA dot, 32 MOA circle or circle dot, finer 1 MOA clicks and a lighter 1 oz body (Holosun lists the EPS Carry at 1.23 oz), for less money. Both mount on the Holosun K footprint, list a 0.58 by 0.77 inch window, load the battery from a side tray and have night-vision brightness settings.
Owners rate the EPS Carry 4.8/5 from 90 reviews on OpticsPlanet, and the whole 507K listing (all colors and models) 4.7/5 from 254. The 507K also comes in green as the HE507K-GR X2 (around $320). Prices verified September 30, 2026; confirm the current price on the retailer page.
How this comparison was made: a research-based, spec-by-spec comparison built from the retailer's specification tables, Holosun's own published specifications and the owner reviews on both listings. We have not bench-tested these two side by side. Every row in the table is listed for both sights. Where Holosun's product page and the retailer differ, we use Holosun's figure: the retailer's weight row for the EPS Carry is garbled, and its brightness count leaves out the night-vision settings. See how we evaluate.
Side-by-side specifications
| Holosun EPS Carry | Holosun HS507K X2 | |
|---|---|---|
| Street price | around $330 | around $300 |
| Owner rating | 4.8/5, 90 reviews on OpticsPlanet | 4.7/5, 254 reviews on OpticsPlanet (whole 507K listing, all colors and models) |
| Emitter | Enclosed | Open |
| Reticle | 2 or 6 MOA dot (fixed), red or green | 2 MOA dot, 32 MOA circle, or circle dot (selectable) |
| Footprint | Holosun K footprint | Holosun K footprint |
| Window | 0.58 x 0.77 in | 0.58 x 0.77 in |
| Battery (Holosun) | CR1620 in a side tray, 50,000 hours at setting 6 | CR1632 in a side tray, up to 50,000 hours |
| Brightness settings (Holosun) | 12 (8 daylight, 4 night-vision) | 12 (10 daylight, 2 night-vision) |
| Adjustment click | 1.5 MOA | 1 MOA |
| Power features | Shake Awake with last-setting recall | Shake Awake, Lock Mode |
| Water resistance | IPX8 | IP67 |
| Weight (Holosun) | 1.23 oz | 1 oz |
| Housing | 7075-T6 aluminum | 7075-T6 aluminum |
| Adapter plate in the box | Yes, RMSc to K (Holosun) | Not listed |
| Check EPS Carry price | Check 507K price |
Same footprint, same window, different front end
Both list a 0.58 by 0.77 inch window, both use the Holosun K footprint, both load the battery from a side tray and both have night-vision compatible settings. The real differences are in how the dot is made and what it looks like.
- Emitter. The EPS Carry seals its LED behind glass, so dust, lint and moisture cannot settle on it and wash out the dot. The 507K is open: the emitter sits in an exposed well that can collect debris in a waistband holster and needs the occasional clean-out.
- Reticle. Holosun lists three selectable reticles on the 507K: a 2 MOA dot, a 32 MOA circle, or the combined circle dot. The EPS Carry gives you one fixed dot, 2 or 6 MOA, chosen when you buy it. Both list the same window, but some EPS Carry owners say finding the dot takes presentation practice, and one recommends the circle-dot MRS version for that reason.
- Adjustment. The 507K clicks in 1 MOA. The retailer lists 1.5 MOA clicks for the EPS Carry.
- Weight. Holosun lists the EPS Carry at 1.23 oz and the 507K at 1 oz.
- What they share. Both load the battery from a side tray, so you change it without unbolting the sight, on different cells: a CR1620 in the EPS Carry, which Holosun rates at 50,000 hours at setting 6, and a CR1632 in the 507K, which Holosun rates at up to 50,000 hours. Holosun lists 8 daylight and 4 night-vision settings on the EPS Carry and 10 daylight and 2 night-vision settings on the 507K.
"I have two Holosun 407k 6 MOA red dot sights and thought the closed emitter version would be better for a S&W Shield due to the ease of cleaning the lenses. After using the EPS Carry I've concluded I probably should have bought a Holosun 407K instead of this optic."
Most helpful positive review of the EPS Carry, via OpticsPlanet. He compares it to the open 407K, the 507K's plain-dot sibling in the same body.
Where they sit among Holosun's K-footprint optics
Every optic below mounts on the same K footprint and lists the same window. That isolates what each step changes.
| Optic | Emitter | Reticle | Battery | Click | Sealing | Price |
|---|---|---|---|---|---|---|
| HS407K-X2 | Open | 6 MOA dot | CR1632, side tray | 1 MOA | IP67 | around $220 |
| HS507K X2 | Open | Dot, circle or circle dot | CR1632, side tray | 1 MOA | IP67 | around $300 |
| EPS Carry | Enclosed | 2 or 6 MOA dot | CR1620, side tray | 1.5 MOA | IPX8 | around $330 |
The open K optics differ from each other only in the reticle. The enclosed EPS Carry is the step that changes the emitter, the battery cell, the click value and the sealing rating, and it is the most expensive of the three. A separate EPS Carry MRS model adds a switchable dot and circle-dot to the enclosed design; we do not card it, so it has no price here. If your slide takes a full-size RMR-pattern optic instead, none of these is the natural choice: the 507C vs 507K section of 407K vs 507K covers what the bigger C body adds.
Fitment and the mounting-screw catch
Both sights are built for slim carry pistols such as the SIG P365 family, the Glock 43X and 48, the S&W Shield Plus and the Springfield Hellcat. The retailer states the 507K is a direct fit for the SIG P365X and P365XL and that slides with a four-boss interface need an adapter plate, which raises the optic and can leave factory irons too low to co-witness. Holosun says the EPS Carry mounts directly on a K footprint and includes an RMSc-to-K adapter plate, and the retailer describes it as Holosun's lowest-height deck, which it says lets the optic work with standard-height iron sights on a variety of pistols.
A repeated owner complaint about the EPS Carry is the hardware, not the optic: the included screws are often too long or wrong for a given pistol, especially on Glock 43X MOS, P365 and Shield Plus setups, and a loose screw costs you your zero. Budget for the correct screws, or a quality plate, whichever sight you buy.
"The screws were too long and produced a tiny bit of wiggle, so it couldn't hold zero. After swapping screws it seems to hold better but I'll need to re-zero."
TeeCee, verified owner (NY), on the EPS Carry, via OpticsPlanet
Who should buy which
- Buy the EPS Carry if the sealed emitter is the point: daily inside-the-waistband carry where lint, dust and moisture find their way in, plus an adapter plate in the box. Accept a fixed dot, 1.5 MOA clicks, a little more weight and a higher price.
- Buy the 507K if you want the circle or circle dot to find the aiming point fast on the draw, finer 1 MOA adjustment and the lighter body, for less money. Accept an open emitter you will clean now and then.
- Consider the 407K if you want the 507K's body with a single 6 MOA dot and no circle, for less again; we compare the two in 407K vs 507K.
FAQ
What is the difference between the Holosun EPS Carry and the 507K?
The emitter and the reticle. The EPS Carry is an enclosed-emitter sight rated IPX8, with a single fixed dot (2 or 6 MOA, red or green). The HS507K X2 is an open-emitter sight rated IP67, and Holosun lists three selectable reticles: a 2 MOA dot, a 32 MOA circle, or the combined circle dot. The retailer lists 1.5 MOA clicks on the EPS Carry against 1 MOA on the 507K, and Holosun lists the EPS Carry at 1.23 oz against 1 oz. Much else is shared: both use the Holosun K footprint, both list a 0.58 by 0.77 inch window, both load the battery from a side tray, and both have night-vision compatible brightness settings.
Is the EPS Carry worth the extra money over the 507K?
Yes, if a sealed emitter is what you want for daily inside-the-waistband carry. An open emitter like the 507K's can collect lint and dust in its emitter well and needs the occasional clean-out; the EPS Carry's enclosed design keeps debris and moisture off the LED, and it includes an adapter plate. What you give up is the circle and circle-dot reticles and the finer 1 MOA clicks, you carry about a quarter of an ounce more, and you pay more. If the circle-dot is what you want, the 507K is the better fit.
Do the EPS Carry and the 507K fit the same pistols?
Both use the Holosun K footprint, built for slim carry pistols such as the SIG P365 family, the Glock 43X and 48, the S&W Shield Plus and the Springfield Hellcat. The retailer states the 507K is a direct fit for the SIG P365X and P365XL and that slides with a four-boss interface need an adapter plate. Holosun says the EPS Carry mounts directly on a K footprint and includes an RMSc-to-K adapter plate. A repeated owner complaint is that the included screws are too long or wrong for specific pistols, especially Glock 43X MOS, P365 and Shield Plus setups. Check your slide and budget for the right screws either way. Glock says its newer Slimline MOS-K cut (item number ending in MOSK) takes Holosun K optics without a plate.
Does the EPS Carry have a circle-dot reticle like the 507K?
No, not the standard EPS Carry compared here. It has a single fixed dot, 2 or 6 MOA, in red or green. A separate EPS Carry MRS model has a switchable dot and circle-dot, and one owner of the standard model recommends it if you want help finding the dot in the small window. One owner of the standard EPS Carry wrote that they expected to toggle between reticles and could not, so check which model you are ordering.
More: Holosun EPS Carry review · Holosun HS507K X2 review · best enclosed red dots · best red dot for the SIG P365 · best red dot for the Hellcat.