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
SIG P365X optic footprint: what red dots fit
The SIG P365X is cut for the Shield RMSc footprint, which SIG calls the Compact footprint, and RMSc-pattern micro dots bolt straight to the slide with nothing under them. The rear sight plate assembly comes off, the optic goes on, and the dot sits as low as this pistol can mount one. The common optic that does not share that base is the Trijicon RMRcc, which uses its own pattern and mounts on the Maple Leaf P365 RMRcc adapter plate. Holosun's K-series dots do not drop straight on either, because their bases and the RMSc lug arrangement do not line up.
Some P365X models arrive with the optic already chosen. SIG sells 365X-9-BXR3P-RS with a ROMEO-RS Compact fitted and 365X-9-BXR3-RXSL with a ROMEO-X SIG-LOC Compact fitted, while the plain optic-ready SKUs ship the rear sight plate assembly over an empty pocket. SIG-LOC is worth understanding before you shop those: its mounting screws enter from beneath the slide rather than down through the optic body, so it is not the same interface as a top-screw RMSc dot.
- Optics that fit
- 21
- No plate needed
- 20
- Plate required
- 1
- Footprints accepted
- Shield RMSc / Holosun K
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Mounts directly (Shield RMSc footprint)(20)
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
Cyelee Optics
Cyelee CAT EDG
$279.99Shield RMSc
One-ounce enclosed-emitter dot on the slim RMSc cut for carry slides
Gideon Optics
Gideon Optics Judge II
$229.99Shield RMSc
RMSc open-emitter carry dot with a protected 20mm window and side-loading CR1632.
Gideon Optics
Gideon Optics Judge XL
$239.99Holosun KShield RMSc
Large-window 6 MOA dot for RMSc and Holosun K mounting patterns.
Gideon Optics
Gideon Optics Valor Mini
$299.99Shield RMSc
Enclosed 3 MOA RMSc optic with a side-loading battery and 6.25mm deck.
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.
Vector Optics
Vector Optics Frenzy FLEX 24x29 (SCRD-C77)
$229Shield RMSc
Large-window competition pistol dot with selectable 2 and 6 MOA reticles
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.
Mounts with an adapter plate(1)
These optics use the same screw spacing but a different locating pattern from the SIG P365X slide cut, so they mount on a plate that bolts into the slide and presents the matching pattern to the optic.
Trijicon
Trijicon RMRcc
$519.99RMRcc
Forged-aluminum micro red dot with Trijicon's proprietary RMRcc footprint for slim carry pistols
Plates that fit this pairing
SIG P365X optic fitment FAQ
What optic footprint does the SIG P365X use?
The SIG P365X is cut for the Shield RMSc footprint, which SIG calls the Compact footprint, and RMSc-pattern micro dots bolt straight to the slide with nothing under them. The rear sight plate assembly comes off, the optic goes on, and the dot sits as low as this pistol can mount one. The common optic that does not share that base is the Trijicon RMRcc, which uses its own pattern and mounts on the Maple Leaf P365 RMRcc adapter plate. Holosun's K-series dots do not drop straight on either, because their bases and the RMSc lug arrangement do not line up.
Do I need an adapter plate to mount a red dot on the SIG P365X?
Only for some optics. The SIG P365X 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 Trijicon RMRcc among them, mount over an adapter plate that bolts into the slide first.
Does the Trijicon RMRcc fit a SIG P365X?
Yes, on a plate. The Trijicon RMRcc mounts on the SIG P365X using the Maple Leaf P365 RMRcc Adapter Plate. Install the plate to the slide first, then the optic to the plate.
Does the SIG Romeo Zero Elite fit a SIG P365X?
Yes. The SIG Romeo Zero Elite uses the Shield RMSc footprint that the SIG P365X slide is cut for, so it bolts straight to the slide with no adapter plate.
Does a Trijicon RMRcc fit the SIG P365X?
Not directly. The RMRcc is a Trijicon pattern of its own, not a small RMR and not an RMSc, so it needs the Maple Leaf P365 RMRcc adapter plate, which bolts into the factory cut and presents the RMRcc pattern to the optic. Maple Leaf lists that plate for the P365X, XL, XMacro, Fuse, and AXG Legion slides, and it ships both M3 and M4 plate-to-slide screw sets plus the 5-40 screws for the optic.
Do P365X and P365 XL red dots interchange?
Yes. SIG lists every P365X and every P365 XL model under the same Compact (Shield RMSc) footprint. The XL runs a longer slide and a longer sight radius, but the optic pocket is the same, so a dot, a set of screws, or an RMRcc plate bought for one works on the other.
Keep reading
Optic footprints for other SIG Sauer models
- P320 Full Size optic footprint
- P320 Compact optic footprint
- P320 X-Carry optic footprint
- P320 X-Five Legion optic footprint
- P320 AXG Pro optic footprint
- P320 Spectre Comp optic footprint
- SIG P365 optic footprint
- SIG P365 XL optic footprint
- SIG P365 X-Macro optic footprint
- SIG P365 Fuse optic footprint