ROMEO-X PRO
The SIG Sauer ROMEO-X SIG-LOC Pro is an enclosed emitter pistol optic on the SIG-LOC footprint, offered with a 6 MOA Dot reticle in red. The window measures 0.91 x 0.91 in, and the aluminum housing measures 1.9 x 1.24 x 0.96 in. It runs on a CR2032 cell that can be changed with the optic still mounted, and adds shake awake and night vision settings. Measured against the 311 pistol optics in the index, it lands in the largest quarter for window area (0.8281 sq in) and in the most expensive quarter for price ($580). It is one of 7 entries in the index that qualify as a SIG-LOC footprint optic. The closest listed comparison is SIG Sauer ROMEO-X SIG-LOC Compact, the same brand's SIG-LOC footprint optic, priced at $550.

| Series | ROMEO-X PRO |
| Reticle color | Red |
| Reticle options | 6 MOA Dot |
| Optic Removal for Battery Change | No |
| Window Size (in) | 0.91 x 0.91 |
| Enclosed | Yes |
| Footprint | SIG-LOC |
| Battery | CR2032 |
| Solar Failsafe | No |
| Shake Awake | Yes |
| Night Vision Compatible | Yes |
| Material | Aluminum |
| Dimensions (in) | 1.9 x 1.24 x 0.96 |
| Country of Manufacture | USA |
| Average Price | $580 |
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