Holosun
Holosun 507C X2
$364.69Cheaper
Best Red Dot Sights · head-to-head
Holosun 507C X2 vs Sig Sauer Romeo-X Pro
A sourced, side-by-side comparison. Holosun 507C X2 is cheaper at $364.69. Every spec and price links to its source.
Sig Sauer
Sig Sauer Romeo-X Pro
$469.99
Released 2023
Which is better: the Holosun 507C X2 or Sig Sauer Romeo-X Pro?
On the specs we track, they're closely matched. The Holosun 507C X2 is the cheaper at $364.69.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Holosun 507C X2 | Sig Sauer Romeo-X Pro |
|---|---|---|
| US price | $364.69 | $469.99 |
| Brand | Holosun | Sig Sauer |
| Released | — | 2023 |
| Sight type | open-reflex | open-reflex |
| Dot size moa | 2 | 2 |
| Reticle type | multi-reticle | circle-dot |
| Objective window (mm) | 23 | 24 |
| Battery type | CR1632 | CR1632 |
| Battery life hrs | 50000 | 20000 |
| Brightness settings | 12 | 15 |
| Mount footprint | Trijicon-RMR | Leupold-DeltaPoint-Pro |
| Weight grams | 42 | 42.5 |
| Length (mm) | 45 | 46.5 |
| Night vision compatible | Yes | Yes |
| Motion activation | Yes | Yes |
Sources — Holosun 507C X2: holosun.com (verified 2026-07-11). Sig Sauer Romeo-X Pro: thetacticalden.com (verified 2026-07-11).
What's the difference between the Holosun 507C X2 and Sig Sauer Romeo-X Pro?
Where the two actually differ on the specs we track (7 of 12). Matching specs are omitted.
- Reticle type: Holosun 507C X2 multi-reticle vs Sig Sauer Romeo-X Pro circle-dot
- Objective window (mm): Holosun 507C X2 23 vs Sig Sauer Romeo-X Pro 24
- Battery life hrs: Holosun 507C X2 50000 vs Sig Sauer Romeo-X Pro 20000
- Brightness settings: Holosun 507C X2 12 vs Sig Sauer Romeo-X Pro 15
- Mount footprint: Holosun 507C X2 Trijicon-RMR vs Sig Sauer Romeo-X Pro Leupold-DeltaPoint-Pro
- Weight grams: Holosun 507C X2 42 vs Sig Sauer Romeo-X Pro 42.5
- Length (mm): Holosun 507C X2 45 vs Sig Sauer Romeo-X Pro 46.5