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Compare full-size and compact handgun-mounted optics.
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“Not documented” means Known Ground has not verified that field. It is not a zero, “none,” or compatibility claim.
| Attribute | SIG SauerROMEO2Specs checked Jul 23, 2026 | AimpointACRO P-2Specs checked Aug 5, 2026 |
|---|---|---|
| Typical price | Not documented | Not documented |
| Weight | 1.58 oz open; 2.10 oz half shroud; 2.50 oz full shroud | 2.2 oz / 61 g |
| Overall dimensions | 1.84 × 1.32 × 1.12 in open; 1.25 in high with shroud | 1.9 × 1.3 × 1.2 in / 47 × 33 × 31 mm |
| Product format | optic | optic |
| Mount / compatibility | SIG PRO / DeltaPoint Pro-family footprint; verify recoil bosses | Aimpoint ACRO interface |
| Catalog status | current | current |
| Adjustment | 1 MOA per click | Not documented |
| Adjustment range | 120 MOA elevation and windage | Not documented |
| Battery | CR2032 | CR2032 |
| Battery life | Up to 25,000 hours at medium setting | 50,000 hours at daylight setting 6 |
| Brightness | 12 daylight and 3 night-vision settings | 4 night-vision and 6 daylight settings |
| Clear aperture | 30 mm diagonal | 0.59 × 0.59 in / 15 × 15 mm |
| Design | Convertible open or enclosed emitter with supplied shrouds | Enclosed emitter |
| Eye relief | Unlimited | Unlimited |
| Housing | Not documented | High-strength aluminum |
| Magnification | 1× | 1× |
| Motion activation | MOTAC | Not documented |
| Parallax | Not documented | Operationally parallax-free |
| Reticle | 3 or 6 MOA red dot | 3.5 MOA red dot |
| Water resistance | IPX7 | Submersible to 115 ft / 35 m |
Editorial context
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ROMEO2: Enclosed-capable duty-focused reflex optic.
ACRO P-2: The Aimpoint ACRO P-2 is a 1× enclosed-emitter reflex sight with a 3.5 MOA red dot. Aimpoint documents a high-strength aluminum housing, a CR2032 battery rated for 50,000 hours at daylight setting 6, four night-vision and six daylight settings, a 15 × 15 mm clear aperture, a 2.2 oz weight, and submersion to 35 m. This is a manufacturer-sourced research record; Known Ground has not marked it as personally tested.
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