Duty Arms IndexAimpoint COA vs Holosun 509T
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.
Aimpoint COA
Aimpoint COA 3.5 MOA (A-CUT interface)
- Agencies (current entry)
- 32
- Share of agencies with a sourced pistol optic
- 30.5%
Holosun 509T
Holosun HE509T-RD X2
- Agencies (current entry)
- 17
- Share of agencies with a sourced pistol optic
- 16.2%
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 | Aimpoint COAAimpoint COA 3.5 MOA (A-CUT interface)12 of 17 fields published | Holosun 509THolosun HE509T-RD X213 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. | A-CUT Interface[1] | 509T Footprint[2] |
| EmitterOpen (exposed emitter) or enclosed, as the maker describes it. | Not published | Fully enclosed emitter[2] |
| Mounting notes (maker's) | Integrated A-CUT™ interface[1] | RMR to 509T Adapter Plate[2] |
| Optical | ||
| Reticle / dot size | 3.5 MOA[1] | 2 MOA Dot & 32 MOA Circle[2] |
| Reticle colour | Red[1] | Not published |
| Window size | 15 × 15 mm[1] | 0.66" x 0.9"[2] |
| Brightness settings | 4 night vision compatible settings and 8 daylight settings[1] | 8 Daylight & 4[2] |
| Night-vision settings | Not published | Not published |
| Power | ||
| Battery | CR2032, 3V, Lithium[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 h at daylight setting 7 (15,000 Lux, room temperature)[1] | 50,000 Hours[2] |
| Battery access | Not published | Not published |
| Auto-on / auto-brightness | Not published | Shake Awake Technology[2] |
| Physical | ||
| Dimensions | 45 x 28 x 30 mm / 1.8 x 1.1 x 1.2 in[1] | 1.6" x 1.16" x 1.13"[2] |
| Weight | 48 g / 1.7 oz[1] | 1.27 oz[2] |
| Housing material | High strength aluminum[1] | 7075 T6 Titanium[2] |
| Water rating (maker's stated) | 25 m / 80 ft[1] | IP67[2] |
| 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. |
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
Aimpoint COA
32 agencies with a current, sourced entry (30.5% of 105 agencies with a sourced pistol optic).
Mounted on (pistol, agencies): Glock G45 (6), Glock G45 Gen6 (6), Glock G43X MOS (5), Glock G45 Gen5 MOS (5).
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).
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.
Aimpoint COA
No notices on file.
Holosun 509T
No notices on file.
We add notices only with a primary document.
Sources
- [1] COA 3.5 MOA - Red dot reflex sight with A-CUT interface for pistols · Aimpoint · accessed Oct 11, 2026 · archive
- [2] Holosun HE509T-RD X2 · Holosun · accessed Oct 11, 2026 · archive