Red Dots That Fit the Sig Sauer P365 FUSE Comp
16 red dots in our database fit the Sig Sauer P365 FUSE Comp directly, on its factory RMSc / SIG-LOC Compact optic cut. Read this page rather than the FUSE’s: despite the shared name, the FUSE Comp defaults to the RMSc-pattern cut while the plain FUSE defaults to SIG-LOC Compact. The exception here runs the other way — 365XF-9-COMP-RXSL is the SIG-LOC SKU. The Comp also puts a shorter, compensated barrel under the FUSE’s long slide, so it recoils flatter than its barrel length suggests.
- Standard P365 FUSE Comp SKUs use the RMSc-pattern cut; 365XF-9-COMP-RXSL uses SIG-LOC Compact (Sig Sauer spec sheets, verified September 2026).
- This is the opposite default from the plain P365 FUSE, which is SIG-LOC Compact on almost every SKU. The two guns share a housing class and not a cut.
- The Comp’s integrated compensator shortens the barrel under a full-length slide, keeping the long sight radius while cutting muzzle rise.
- 16 optics fit the P365 FUSE Comp 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 Comp
| 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 Comp use?
The RMSc pattern on standard SKUs, with 365XF-9-COMP-RXSL on SIG-LOC Compact. Note that this is the reverse of the plain FUSE, which is SIG-LOC on almost every SKU.
Is the P365 FUSE Comp the same optic cut as the P365 FUSE?
No. The FUSE Comp defaults to the RMSc pattern and the plain FUSE defaults to SIG-LOC Compact. They share a housing class, which makes the difference easy to miss and expensive to get wrong.
Does the Holosun 507K fit the Sig P365 FUSE Comp?
Yes on the standard RMSc-pattern SKUs. The 507K X2 uses the Holosun K-series footprint, a modified RMSc, and mounts directly with no adapter plate.
Does the compensator change which red dot fits?
No. The footprint is set by the slide cut, and the comp sits at the muzzle. What it changes is how hard the optic has to work: less muzzle rise means the dot returns to the same place more consistently.