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Compare full-size and compact handgun-mounted optics.
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Select two pistol optics
Step 3
Review the differences
“Not documented” means Known Ground has not verified that field. It is not a zero, “none,” or compatibility claim.
| Attribute | Shield SightsRMSxSpecs checked Jul 23, 2026 | AimpointACRO P-2Specs checked Aug 5, 2026 |
|---|---|---|
| Typical price | Not documented | Not documented |
| Weight | 1.0 oz / 28.6 g excluding battery | 2.2 oz / 61 g |
| Overall dimensions | 1.61 × 1.34 × 1.07 in / 40.8 × 34 × 27.3 mm | 1.9 × 1.3 × 1.2 in / 47 × 33 × 31 mm |
| Product format | optic | optic |
| Mount / compatibility | Shield RMS / RMSc footprint | Aimpoint ACRO interface |
| Catalog status | current | current |
| Battery | Underside CR2032 | CR2032 |
| Battery life | 20,000-hour average in daylight | 50,000 hours at daylight setting 6 |
| Brightness | Automatic; lowest level is night-vision compatible | 4 night-vision and 6 daylight settings |
| Clear aperture | Not documented | 0.59 × 0.59 in / 15 × 15 mm |
| Design | Open emitter | Enclosed emitter |
| Eye relief | Unlimited | Unlimited |
| Housing | Aluminum | High-strength aluminum |
| Lens | Glass | Not documented |
| Magnification | 1× | 1× |
| Parallax | Not documented | Operationally parallax-free |
| Reticle | 4 MOA, 8 MOA, or 65 MOA ring with 2 MOA dot | 3.5 MOA red dot |
| Water resistance | IP67: 3 ft / 1 m for 30 minutes | Submersible to 115 ft / 35 m |
Editorial context
Choose by use case, not scoreboard.
RMSx: Full-size 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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