Duty Arms IndexDuty Arms Index
Pistol optic evaluation memo: Aimpoint COA vs Trijicon RMR HD
| Version compared | Aimpoint COAAimpoint COA 3.5 MOA (A-CUT interface) | Trijicon RMR HDTrijicon RMR HD (3.25 MOA dot / 55 MOA ring) |
|---|---|---|
| Mounting footprint | A-CUT Interface [1] | IDENTICAL FOOTPRINT AS RMR [2] |
| Emitter | Not published | Not published |
| Mounting notes (maker's) | Integrated A-CUT™ interface [1] | Not published |
| Reticle / dot size | 3.5 MOA [1] | 3.25 MOA dot with 55 MOA Selectable Reticle [2] |
| Reticle colour | Red [1] | Red [2] |
| Window size | 15 × 15 mm [1] | Not published |
| Brightness settings | 4 night vision compatible settings and 8 daylight settings [1] | Nine brightness settings with multiple modes [2] |
| Night-vision settings | Not published | Not published |
| Battery | CR2032, 3V, Lithium [1] | CR2032 [2] |
| Battery life (maker's stated) | 50,000 h at daylight setting 7 (15,000 Lux, room temperature) [1] | Over 3 years of continuous use in brightness setting 5, dot only [2] |
| Battery access | Not published | TOP-LOADING BATTERY [2] |
| Auto-on / auto-brightness | Not published | Not published |
| Dimensions | 45 x 28 x 30 mm / 1.8 x 1.1 x 1.2 in [1] | 2.15 in x 1.27 in x 1.19 in [2] |
| Weight | 48 g / 1.7 oz [1] | 1.69 oz. (47.91g) [2] |
| Housing material | High strength aluminum [1] | 7075-T6 aluminum [2] |
| Water rating (maker's stated) | 25 m / 80 ft [1] | waterproof up to 66 ft. (20 m) [2] |
| Maker list price | Not published | $1,019.00 [2] |
| Agencies issuing (current entry) | 32 of 105 agencies with a sourced pistol optic | 5 of 105 agencies with a sourced pistol optic |
| Most common host pistol | Glock G45 (6) | Glock G17M (1) |
Notices
No recalls, safety statements or agency actions on file for either model.
Sources
- [1] COA 3.5 MOA - Red dot reflex sight with A-CUT interface for pistols. Aimpoint. Accessed Oct 11, 2026. https://www.aimpoint.com/products/coa-35-moa-red-dot-reflex-sight-with-a-cut-interface-for-pistols (archive: https://web.archive.org/web/2026/https://www.aimpoint.com/products/coa-35-moa-red-dot-reflex-sight-with-a-cut-interface-for-pistols)
- [2] Trijicon RMR HD Red Dot Sight. Trijicon. Accessed Oct 11, 2026. https://www.trijicon.com/products/details/rmhd2-c-3200002 (archive: https://web.archive.org/web/2026/https://www.trijicon.com/products/details/rmhd2-c-3200002)