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SIG P365 optic footprint: what red dots fit

The optic-ready SIG P365 slide is cut for one footprint, the Shield RMSc pattern, which SIG lists as its Compact footprint. There is no plate in the system: the pocket, the recoil lugs, and the screw holes are milled into the slide, so an RMSc-pattern micro dot seats on bare slide steel at the lowest height this pistol offers. That covers most of the micro-compact class, from small open-emitter dots to enclosed carry optics built on the same base. Holosun's K-pattern optics are the exception to understand before you buy, because their bases carry fewer lug pockets than the RMSc cut stands lugs.

The P365 name covers two different slides. SIG still catalogs the original P365 Nitron Micro-Compact, SKUs 365-9-BXR3 and 365-9-BXR3-MS, and lists both as not optic ready: no pocket, no lugs, no screw holes. The optic-ready gun is the P365 Nitron, SKU 365-9-BXR3P, and the P on the end of the SKU is the tell. Look at the slide behind the rear sight before you buy a dot. A removable cover plate over a recessed pocket means the cut is there; unbroken slide steel means a milling service or a replacement slide.

Optics that fit: 20
No plate needed: 20
Plate required: 0
Footprints accepted: Shield RMSc / Holosun K

Open the interactive checker on the SIG P365

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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.

C&H Precision EDC red dot for SIG P365

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

Osight K (RMSc 6 MOA Green) red dot for SIG P365

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 K (RMSc 6 MOA Open) red dot for SIG P365

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 SE Enclosed (2 MOA + 32 MOA Red MRS) red dot for SIG P365

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 SE Enclosed (6 MOA Green) red dot for SIG P365

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 SE Enclosed (6 MOA Red) red dot for SIG P365

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 EDC Enclosed red dot for SIG P365

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 Max red dot for SIG P365

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 CAT EDG red dot for SIG P365

Cyelee Optics

Cyelee CAT EDG

$279.99Shield RMSc

One-ounce enclosed-emitter dot on the slim RMSc cut for carry slides

Gideon Optics Judge II red dot for SIG P365

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 Judge XL red dot for SIG P365

Gideon Optics

Gideon Optics Judge XL

$239.99Holosun KShield RMSc

Large-window 6 MOA dot for RMSc and Holosun K mounting patterns.

Gideon Optics Valor Mini red dot for SIG P365

Gideon Optics

Gideon Optics Valor Mini

$299.99Shield RMSc

Enclosed 3 MOA RMSc optic with a side-loading battery and 6.25mm deck.

Osight S Enclosed (Magnetic Charging) red dot for SIG P365

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 Romeo Zero Elite red dot for SIG P365

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 Sentinel II red dot for SIG P365

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 Frenzy FLEX 24x29 (SCRD-C77) red dot for SIG P365

Vector Optics

Vector Optics Frenzy FLEX 24x29 (SCRD-C77)

$229Shield RMSc

Large-window competition pistol dot with selectable 2 and 6 MOA reticles

Vortex Defender-CCW Enclosed Solar red dot for SIG P365

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 HNT-R Max red dot for SIG P365

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 RMSc 4 MOA (Glass Edition) red dot for SIG P365

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 ROMEO-X Compact Enclosed red dot for SIG P365

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.

SIG P365 optic fitment FAQ

What optic footprint does the SIG P365 use?

The optic-ready SIG P365 slide is cut for one footprint, the Shield RMSc pattern, which SIG lists as its Compact footprint. There is no plate in the system: the pocket, the recoil lugs, and the screw holes are milled into the slide, so an RMSc-pattern micro dot seats on bare slide steel at the lowest height this pistol offers. That covers most of the micro-compact class, from small open-emitter dots to enclosed carry optics built on the same base. Holosun's K-pattern optics are the exception to understand before you buy, because their bases carry fewer lug pockets than the RMSc cut stands lugs.

Do I need an adapter plate to mount a red dot on the SIG P365?

No. The SIG P365 slide is cut for the Shield RMSc footprint and Shield RMSc optics bolt straight to the slide.

Does the SIG Romeo Zero Elite fit a SIG P365?

Yes. The SIG Romeo Zero Elite uses the Shield RMSc footprint that the SIG P365 slide is cut for, so it bolts straight to the slide with no adapter plate.

Does a Holosun 507K or 407K mount directly on a SIG P365?

Not as a drop-in. The P365 optic cut is the Shield RMSc pattern, which stands four recoil lugs up in the pocket, and a Holosun K-pattern optic has only two lug pockets in its base, so two slide lugs are left with nowhere to seat. The two real fixes are the adapter hardware Holosun ships with its K-series optics, or filing the extra lugs off the slide, which permanently changes the slide. An RMSc-pattern dot in the other direction needs none of that.

Do the SIG P365 and P365X use the same optic cut?

Yes. SIG lists the optic-ready P365 and every P365X model under the same Compact (Shield RMSc) footprint, so a dot that bolts to one bolts to the other. What changes between them is the grip module, the magazine capacity, and the accessory rail, not the interface under the optic.

Keep reading

Best SIG P365 upgrades Best concealed carry pistols Best pistol red dots Check co-witness height

Optic footprints for other SIG Sauer models

Every pistol with a footprint page

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