C&H Precision
C&H Precision EDC
$199.99EPS / KShield RMSc
Compact open-emitter carry optic on the RMSc footprint with red, green, and MRS variants
Glock 43X MOS optic footprint: what red dots fit
The Glock 43X MOS slide is cut for the Shield RMSc footprint: two screws with four locating bosses, two at the front and two at the rear. Any optic on that RMSc pattern drops straight onto the cut and bolts down with no plate. Holosun's K-series dots (407K, 507K, EPS Carry) match the screw spacing but carry only two locating pockets, so on a four-boss slimline cut they sit on an adapter plate instead of on the bosses. Nothing in the RMR size class fits at all: the slimline slide is too narrow, and no plate converts an RMSc cut up to an RMR.
Read the item number on the case sticker before you order a plate. Glock started shipping an updated slimline cut in late 2025: slides marked MOS use the original four-boss RMSc pattern, and slides marked MOSK use the two-boss Holosun K pattern. On a MOSK 43X a K-footprint dot mounts directly and the plate is wasted money; on the original MOS cut it is required.
- Optics that fit
- 21
- No plate needed
- 16
- Plate required
- 5
- Footprints accepted
- Shield RMSc / Holosun K
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Mounts directly (Shield RMSc footprint)(16)
These optics carry the Shield RMSc footprint the slide is cut for. Screws, recoil bosses, and pocket all line up, so they seat on the slide with no plate.
Osight
Osight K (RMSc 6 MOA Green)
$169.99Shield RMSc
Green-dot version of the open-emitter RMSc Osight K, with a 6 MOA green dot, side-loading CR1620, and motion sensor activation.
Osight
Osight K (RMSc 6 MOA Open)
$159.99Shield RMSc
Entry-level open-emitter RMSc red dot with a 6 MOA dot, side-loading CR1620, and motion sensor activation.
Osight
Osight SE Enclosed (2 MOA + 32 MOA Red MRS)
$199.99Shield RMSc
Enclosed-emitter red dot on the RMSc footprint with a switchable 2 MOA dot and 32 MOA circle, side-loading battery, and IPX7 sealing.
Osight
Osight SE Enclosed (6 MOA Green)
$199.99Shield RMSc
Enclosed-emitter green dot on the RMSc footprint with a side-loading battery and a 75,000-hour runtime, at a value price.
Osight
Osight SE Enclosed (6 MOA Red)
$179.99Shield RMSc
Enclosed-emitter 6 MOA red dot on the RMSc footprint with a side-loading battery, motion sensor, and IPX7 sealing for slim carry guns.
C&H Precision
C&H Precision EDC Enclosed
$249.99EPS / KShield RMSc
Enclosed-emitter RMSc-footprint carry optic with a low-profile compact housing
C&H Precision
C&H Precision Max
$339.99EPS / KShield RMSc
Large-window RMSc-footprint multi-reticle optic for compact pistols and shotgun plates
Osight
Osight S Enclosed (Magnetic Charging)
$249.99Shield RMSc
Enclosed-emitter RMSc red dot with a magnetic charging cover, OAL housing, and a 2 MOA + 32 MOA multi-reticle system.
SIG Sauer
SIG Romeo Zero Elite
$129.99Shield RMSc
Sub-half-ounce micro red dot on the Shield RMSc footprint for P365 and similar carry pistols
Swampfox
Swampfox Sentinel II
$249Shield RMSc
Mid-tier RMSc-footprint micro red dot with Shake N' Wake auto-on, recessed hood for lens protection, and a clean 3 MOA dot, $269 (red) or $299 with tritium.
Vortex
Vortex Defender-CCW Enclosed Solar
$259.49Shield RMSc
Closed emitter micro pistol optic with solar assist on the Shield RMSc footprint
C&H Precision
C&H Precision HNT-R Max
$399.99EPS / KShield RMSc
Camo RMSc-footprint hunting red dot for handguns, shotguns, and scout-style mounts
Shield Sights
Shield RMSc 4 MOA (Glass Edition)
$379.99Shield RMSc
The original RMSc that defined the slim-pistol footprint standard. UK-made glass-edition reflex sight with a 4 MOA dot, $379, the platonic Shield-cut optic.
SIG Sauer
SIG ROMEO-X Compact Enclosed
$499.99Shield RMSc
SIG's enclosed-emitter pistol red dot on the RMSc footprint, with MOTAC motion activation and a side-loading CR1632.
Trijicon
Trijicon RMRcc
$519.99Shield RMSc
Trijicon quality in a compact package for slim carry pistols
Mounts with an adapter plate(5)
These optics use the same screw spacing but a different locating pattern from the Glock 43X MOS slide cut, so they mount on a plate that bolts into the slide and presents the matching pattern to the optic.
Holosun
Holosun 407K X2
$224.99EPS / KHOLOSUN-K
The value Holosun K-series. Single 6 MOA dot, Shake Awake, side-loading CR1632, and the K Series / modified RMSc footprint. ~$100 cheaper than the 507K X2.
Plates that fit this pairing
Holosun
Holosun 507K X2
$295.99EPS / KHOLOSUN-K
Compact multi-reticle optic for slim and subcompact pistols
Plates that fit this pairing
Holosun
Holosun EPS Carry
$329.99EPS / KHolosun EPS
Enclosed emitter compact optic for slim pistols
Plates that fit this pairing
Holosun
Holosun EPS Full Size
$399.99EPS / KHolosun EPS
Full-size enclosed pistol optic on Holosun K-series footprint with included RMR adapter plate
Plates that fit this pairing
Holosun
Holosun SCS Carry
$399.99EPS / KHolosun EPS
Solar-charging enclosed micro red dot with multi-reticle system for slim carry pistols
Plates that fit this pairing
Glock 43X MOS optic fitment FAQ
What optic footprint does the Glock 43X MOS use?
The Glock 43X MOS slide is cut for the Shield RMSc footprint: two screws with four locating bosses, two at the front and two at the rear. Any optic on that RMSc pattern drops straight onto the cut and bolts down with no plate. Holosun's K-series dots (407K, 507K, EPS Carry) match the screw spacing but carry only two locating pockets, so on a four-boss slimline cut they sit on an adapter plate instead of on the bosses. Nothing in the RMR size class fits at all: the slimline slide is too narrow, and no plate converts an RMSc cut up to an RMR.
Do I need an adapter plate to mount a red dot on the Glock 43X MOS?
Only for some optics. The Glock 43X MOS slide is cut for the Shield RMSc footprint, so Shield RMSc optics bolt straight to the slide with no plate. Optics that do not share that locating pattern, the Holosun 407K X2, Holosun 507K X2 and Holosun EPS Carry among them, mount over an adapter plate that bolts into the slide first.
Does the Holosun 507K X2 fit a Glock 43X MOS?
Yes, on a plate. The Holosun 507K X2 is a Shield RMSc / Holosun K footprint optic, so it mounts on the Glock 43X MOS using the Calculated Kinetics Glock 43X / 48 MOS Adapter Plate. Install the plate to the slide first, then the optic to the plate.
Does the Holosun EPS Carry fit a Glock 43X MOS?
Yes, on a plate. The Holosun EPS Carry mounts on the Glock 43X MOS using the Calculated Kinetics Glock 43X / 48 MOS Adapter Plate. Install the plate to the slide first, then the optic to the plate.
Does the Trijicon RMRcc fit a Glock 43X MOS?
Yes. The Trijicon RMRcc uses the Shield RMSc footprint that the Glock 43X MOS slide is cut for, so it bolts straight to the slide with no adapter plate.
Does the SIG Romeo Zero Elite fit a Glock 43X MOS?
Yes. The SIG Romeo Zero Elite uses the Shield RMSc footprint that the Glock 43X MOS slide is cut for, so it bolts straight to the slide with no adapter plate.
Can I mount an RMR on a Glock 43X MOS?
No. The RMR footprint is far wider than the slimline slide and there is no plate that converts an RMSc cut up to an RMR. Micro optics on the RMSc or Holosun K pattern are the only red dots that mount on a 43X MOS.
Can I mount a red dot on a Glock 43X that is not MOS?
Not without work. The standard Glock 43X slide has no optic cut, so the paths are a milling service cutting the slide for RMSc, or an aftermarket optic-cut slimline slide. The 43X MOS is the factory version that already has the cut.
Keep reading
Optic footprints for other Glock models
- Glock 19 Gen5 MOS optic footprint
- Glock 19 Gen6 optic footprint
- Glock 17 Gen5 MOS optic footprint
- Glock 17 Gen6 optic footprint
- Glock 45 Gen5 MOS optic footprint
- Glock 45 Gen6 optic footprint
- Glock 34 Gen5 MOS optic footprint
- Glock 48 MOS optic footprint
- Glock 47 MOS optic footprint
- Glock 49 MOS optic footprint
- Glock 26 Gen5 MOS optic footprint