Red Dots That Fit the Sig Sauer P365 FUSE
16 red dots in our database fit the Sig Sauer P365 FUSE directly, on its factory SIG-LOC Compact / RMSc optic cut. The FUSE is the exception in this family and the reason to read its own page rather than a sibling’s: it defaults to Sig’s SIG-LOC Compact cut, where every other P365 defaults to the RMSc pattern. The RMSc cut appears on one SKU only, 365XF-9-BFO-RS, the ROMEO-RS-equipped gun. The table below lists what mounts on either cut, so check which SKU you own before you choose — this is the model where guessing from the family name gets it wrong.
- The P365 FUSE is the only model in the family that defaults to the SIG-LOC Compact cut. The BFO, CFO, -10, -MS and -RXSL SKUs are all SIG-LOC (live per-SKU read, September 2026).
- The RMSc pattern appears on one FUSE SKU: 365XF-9-BFO-RS, which ships with a ROMEO-RS fitted.
- The FUSE runs the longest barrel in the P365 line with no compensator, and shares its magazine with the XMacro.
- 16 optics fit the P365 FUSE as a direct mount; 15 of them have live, feed-verified prices today.
- The least expensive with a verified price right now is the Sig Sauer Romeo RS Compact at $149.99.
- 9 of the fitting optics are enclosed-emitter designs, including the Osight S.
Every red dot that fits the P365 FUSE
| Optic | Footprint | Reticle | Window | Battery life | Price | |
|---|---|---|---|---|---|---|
 Sig Sauer Romeo RS CompactSig Sauer | Shield RMSc | 3 MOA / 6 MOA / Circle Dot | 24mm | 20,000 hrs | $149.99 | Buy at OpticsPlanet ↗ |
 Osight SOlight | Shield RMSc | 2 MOA Dot & 32 MOA Circle | 0.83" x 0.55" | 21,900 hrs at level 3 | $150.00 | Buy at OpticsPlanet ↗ |
 Osight KOlight | Shield RMSc | 6 MOA Dot | 0.83" x 0.55" | 75,000 hrs | $159.99 | Buy at Olight ↗ |
 Osight SEOlight | Shield RMSc | 2 MOA Dot & 32 MOA Circle / 6 MOA Dot | 0.83" x 0.55" | 75,000 hrs | $179.99 | Buy at OpticsPlanet ↗ |
 Sig Sauer Romeo MDCSig Sauer | Shield RMSc | 3 MOA / 6 MOA | 25mm | 20,000 hrs | $193.99 | Buy at OpticsPlanet ↗ |
 Vortex Defender CCWVortex | Shield RMSc | 3 MOA / 6 MOA Dot | micro | 9,500 hrs | $209.99 | Buy at OpticsPlanet ↗ |
 Holosun 407K X2Holosun | Holosun K-Series / Modified RMSc | 6 MOA Dot | 0.77" x 0.58" | 50,000 hrs | $224.99 | Buy at OpticsPlanet ↗ |
 Holosun 507K X2Holosun | Holosun K-Series / Modified RMSc | 2 MOA Dot & 32 MOA Circle (MRS) | 0.77" x 0.58" | 50,000 hrs | $319.99 | Buy at OpticsPlanet ↗ |
 Holosun EPSHolosun | Holosun K-Series / Modified RMSc | 2 MOA Dot / 6 MOA Dot / MRS (2 MOA + 32 MOA Circle) | 0.91" x 0.63" | 50,000 hrs | $329.99 | Buy at OpticsPlanet ↗ |
 Holosun EPS CarryHolosun | Holosun K-Series / Modified RMSc | 2 MOA Dot / 6 MOA Dot / MRS (2 MOA + 32 MOA Circle) | 0.77" x 0.58" | 50,000 hrs | $329.99 | Buy at OpticsPlanet ↗ |
| Shield RMSc | 3 MOA Dot / Multi-Reticle (3 MOA + 32 MOA) | ~0.79" x 0.73" | 125,000 hrs (solar) / 9,500 hrs (battery only) | $379.00 | Buy at OpticsPlanet ↗ | |
 Sig Sauer Romeo X-CompactSig Sauer | Shield RMSc | 6 MOA | 0.81" x 0.62" | 20,000 hrs | $379.99 | Buy at OpticsPlanet ↗ |
 Holosun SCS Carry GRHolosun | Holosun K-Series / Modified RMSc | 2 MOA Dot & 32 MOA Circle | 0.77" x 0.58" | 20,000 Hrs Reserve | $399.99 | Buy at OpticsPlanet ↗ |
 Sig Sauer Romeo-X Enclosed CompactSig Sauer | Shield RMSc | 3 MOA / 6 MOA / Circle Dot | 24mm | 20,000 hrs | $479.99 | Buy at OpticsPlanet ↗ |
 Sig Sauer Romeo-X SIG-LOC CompactSig Sauer | SIG-LOC Compact | 3 MOA / 6 MOA / Circle Dot | 24mm | 20,000 hrs | $529.99 | Buy at OpticsPlanet ↗ |
 Holosun EPS COREHolosun | Shield RMSc | 2 MOA Dot / 3 MOA Dot / 32 MOA Circle / MRS | 0.9" x 0.63" | 50,000 hrs | Check price | Buy at OpticsPlanet ↗ |
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What optic cut does the Sig P365 FUSE use?
SIG-LOC Compact on almost every SKU — BFO, CFO, -10, -MS and -RXSL. That makes it the only P365 model that does not default to the RMSc pattern, which is the single most important thing to know before buying an optic for one.
Does the Holosun 507K fit the Sig P365 FUSE?
On the RMSc-pattern SKU, 365XF-9-BFO-RS, yes — the 507K X2 uses the Holosun K-series footprint, a modified RMSc. On the SIG-LOC SKUs the native fit is a SIG-LOC optic; per Sig, SIG-LOC slides still accept traditional RMSc-pattern optics, so check your own slide rather than assuming either way.
Which P365 FUSE SKU has the RMSc cut?
365XF-9-BFO-RS, the ROMEO-RS-equipped gun, per a live per-SKU spec read in September 2026. Every other current FUSE SKU is SIG-LOC Compact.
Do the P365 FUSE and P365 XMacro take the same red dots?
They share a magazine, not a default cut. The XMacro is RMSc-pattern as standard while the FUSE defaults to SIG-LOC Compact, so an optic chosen for one is not automatically the native fit on the other.
Is the P365 FUSE Comp the same cut as the FUSE?
No, and it catches people out. The FUSE defaults to SIG-LOC Compact, but the FUSE Comp defaults to the RMSc pattern. Same housing class, opposite defaults — read the page for the exact gun you own.