The SIG Sauer ROMEO5X GEN II is a red dot rifle optic at 1x magnification, using a 2 MOA aiming point in red. It ships on a fixed mount. It runs on an AAA cell and adds shake awake, night vision settings, and an enclosed emitter. The aluminum body measures 4.21 x 2.40 x 2.87 in and 6.1 oz. Measured against the 320 red dots and prisms in the index, it lands in the lightest quarter for weight (6.1 oz). It is one of 149 entries in the index that qualify as a red dot at 1x. The closest listed comparison is SIG Sauer ROMEO-MSR GEN II, the same brand's red dot at 1x, priced at $140.

| Series | ROMEO5X GEN II |
| Optic Type | Red Dot |
| Magnification | 1 |
| Reticle Color | Red |
| Reticle Size (MOA) | 2 |
| Solar Failsafe | No |
| Shake Awake | Yes |
| Night Vision Compatible | Yes |
| Enclosed | Yes |
| Battery | AAA |
| Optic Removal for Battery Change | No |
| Mount Type | Fixed |
| Material | Aluminum |
| Weight (oz) | 6.1 |
| Dimensions (in) | 4.21 x 2.40 x 2.87 |
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