Duty Arms IndexEOTech EXPS3 vs Trijicon ACOG 4x32 (TA31)
Data coverage: Adoption is based on 12 agencies in the Duty Arms Index with a current, sourced rifle 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.
EOTech EXPS3
EOTech HWS EXPS3
- Agencies (current entry)
- 2
- Share of agencies with a sourced rifle optic
- 16.7%
Trijicon ACOG 4x32 (TA31)
Trijicon ACOG 4x32 BAC TA31 (.223 / 5.56 BDC)
- Agencies (current entry)
- 0
- Share of agencies with a sourced rifle optic
- 0%
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 | EOTech EXPS3EOTech HWS EXPS39 of 17 fields published | Trijicon ACOG 4x32 (TA31)Trijicon ACOG 4x32 BAC TA31 (.223 / 5.56 BDC)12 of 17 fields published |
|---|---|---|
| Optical | ||
| TypeRed dot, holographic, prism, LPVO or magnifier, in the maker's words. | HWS[1] | Riflescope[2] |
| Magnification | Not published | 4x[2] |
| Objective / aperture | Not published | 32mm[2] |
| Reticle | Not published | Donut[2] |
| Focal plane | Not published | Not published |
| Eye relief | Not published | 1.5 in. (38.1mm)[2] |
| Field of view | Not published | 36.8 ft. @ 100 yds. (12.27m @ 100m)[2] |
| Brightness / illumination settings | 20 daylight settings[1] | Fiber Optics & Tritium[2] |
| Night-vision settings | 10 additional settings for Gen I through III+ night vision devices[1] | Not published |
| Power | ||
| Battery | 1 x CR123 battery[1] | Not published |
| Battery life (maker's stated) | 1,000 continuous hours at nominal setting 12 at room temperature[1] | Not published |
| Mounting | ||
| Mount (as supplied) | 1" Weaver or MIL-STD-1913 rail[1] | M16 / AR15 Carry Handle Base[2] |
| Optical axis / mount height | Not published | Not published |
| Physical | ||
| Length / dimensions | 3.8" x 2.3" x 2.9" (96.5 x 58.4 x 73.7 mm)[1] | 5.93 in x 2 in x 2.3 in[2] |
| Weight | 11.2 oz (317.5 g)[1] | 10.9 oz. (309.01g)[2] |
| Water rating (maker's stated) | 33 ft. (10 m) depth[1] | -66 ft. (-20m)[2] |
| Price | ||
| Maker list price | Not published | $1,637.00[2] |
| Maker notes | — | Battery-free: the maker lists fiber optics and tritium as the illumination source. TA31 is sold with several reticles and mounts; this row is the base TA31 (red donut, carry-handle base). |
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
EOTech EXPS3
2 agencies with a current, sourced entry (16.7% of 12 agencies with a sourced rifle optic).
Small sample: rifle-optic entries are still thin in the index.
Mounted on (long gun, agencies): Colt M4 Carbine (1), Heckler & Koch MR556A1 (1).
Trijicon ACOG 4x32 (TA31)
0 agencies with a current, sourced entry (0% of 12 agencies with a sourced rifle optic).
Not yet in any sourced agency entry; shown for its maker specs.
Counts are agencies (not officers or units) with a current entry backed by a public source; SWAT / tactical-unit entries are not counted. 12 agencies have any sourced rifle 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.
EOTech EXPS3
No notices on file.
Trijicon ACOG 4x32 (TA31)
No notices on file.
We add notices only with a primary document.
Sources
- [1] EOTech HWS EXPS3 · EOTech · accessed Oct 11, 2026 · archive
- [2] Trijicon ACOG 4x32 BAC Riflescope - .223 / 5.56 BDC · Trijicon · accessed Oct 11, 2026 · archive