Duty Arms IndexHolosun 509T vs SIG SAUER ROMEO-X
Data coverage: Adoption is based on 105 agencies in the Duty Arms Index with a current, sourced pistol optic entry; SWAT / tactical-unit entries are not counted. Counts include only current entries with a public source; agencies not yet in the index, or without a sourced entry for this item, are not counted, so treat shares as a picture of the Duty Arms Index, not of every agency. These counts cover US agencies only; agencies outside the US are not included here (see agencies by country). Data last updated Oct 11, 2026.
Holosun 509T
Holosun HE509T-RD X2
- Agencies (current entry)
- 17
- Share of agencies with a sourced pistol optic
- 16.2%
SIG SAUER ROMEO-X
SIG SAUER ROMEO-X PRO
- Agencies (current entry)
- 1
- Share of agencies with a sourced pistol optic
- 1%
Representative photo: SIG ROMEO1 on a P320; no freely licensed ROMEO-X photo found. Photo: Picanox, CC BY-SA 4.0, via Wikimedia Commons (cropped). Model photo, not the agency's own firearm.
Maker specs, side by side
Print evaluation memoValues are copied exactly as each maker publishes them, with a numbered source for each; we don't test, convert units or rate anything. “Not published” means the maker's current spec page or manual doesn't list it. Columns are in order of agency count in the index, not preference. Shaded rows differ.
| Version shown | Holosun 509THolosun HE509T-RD X213 of 17 fields published | SIG SAUER ROMEO-XSIG SAUER ROMEO-X PRO7 of 17 fields published |
|---|---|---|
| Mounting | ||
| Mounting footprintThe maker's footprint name (RMR, ACRO, RMSc, DeltaPoint Pro, K...). It must match the slide cut or adapter plate. | 509T Footprint[1] | PRO[2] |
| EmitterOpen (exposed emitter) or enclosed, as the maker describes it. | Fully enclosed emitter[1] | Not published |
| Mounting notes (maker's) | RMR to 509T Adapter Plate[1] | Not published |
| Optical | ||
| Reticle / dot size | 2 MOA Dot & 32 MOA Circle[1] | 3 MOA, 6 MOA, CIRCLE DOT[2] |
| Reticle colour | Not published | Not published |
| Window size | 0.66" x 0.9"[1] | 24 mm[2] |
| Brightness settings | 8 Daylight & 4[1] | 12 Daytime 3 Night Vision[2] |
| Night-vision settings | Not published | Not published |
| Power | ||
| Battery | CR1632[1] | (1) CR1632[2] |
| Battery life (maker's stated)As stated, usually at a mid brightness setting; not comparable across makers unless the setting matches. | 50,000 Hours[1] | 20000 hrs[2] |
| Battery access | Not published | Not published |
| Auto-on / auto-brightness | Shake Awake Technology[1] | Not published |
| Physical | ||
| Dimensions | 1.6" x 1.16" x 1.13"[1] | Height 0.94 in [23.88 mm]; Overall Length 1.83 in [46.48 mm][2] |
| Weight | 1.27 oz[1] | Not published |
| Housing material | 7075 T6 Titanium[1] | Not published |
| Water rating (maker's stated) | IP67[1] | Not published |
| Price | ||
| Maker list price | Not published | Not published |
| Maker notes | Battery life is the maker's figure for setting 6. Mounting notes: adapter plate included with the optic, as listed by the maker. | From the Internet Archive copy of the maker page (SIG blocks automated access). The page's 'Overall Width' row shows a weight figure, so width and weight are left as not published. |
Specs checked against the maker's page on Oct 11, 2026. Makers revise pages; confirm with the manufacturer before purchase. Spotted an error? Send a correction with a source. How we compile specs.
Agency adoption and pistol pairings
Holosun 509T
17 agencies with a current, sourced entry (16.2% of 105 agencies with a sourced pistol optic).
Mounted on (pistol, agencies): Glock G45 Gen5 MOS (5), Glock G45 MOS (4), Glock G47 MOS (4), Glock G45 (2).
SIG SAUER ROMEO-X
1 agency with a current, sourced entry (1% of 105 agencies with a sourced pistol optic).
Mounted on (pistol, agencies): SIG SAUER P320 (1).
Counts are agencies (not officers or units) with a current entry backed by a public source; SWAT / tactical-unit entries are not counted. 105 agencies have any sourced pistol optic in the index.
Notices
Recalls, safety statements and agency actions, dated and linked to the original document. Listed the same way for every maker; facts only, no commentary.
Holosun 509T
No notices on file.
SIG SAUER ROMEO-X
No notices on file.
We add notices only with a primary document.
Sources
- [1] Holosun HE509T-RD X2 · Holosun · accessed Oct 11, 2026 · archive
- [2] ROMEO-X PRO · SIG SAUER · accessed Oct 11, 2026 · archived maker page, captured Oct 2, 2026