Holosun SCS-320-GR vs EPS-RD-2

The biggest cited difference is power and footprint: Holosun lists the SCS-320-GR as a solar-powered green multi-reticle optic with a direct-mount DPP footprint for SIG P320 slides, and the EPS-RD-2 as a CR1620 battery red 2 MOA dot on a K footprint. Both are enclosed with a 0.9″ × 0.63″ window. Figures are copied from Holosun’s pages, checked November 5, 2026.

At a glance

Like for like: the footprints are different and not interchangeable. The SCS-320-GR is a DPP / P320 direct mount, and the EPS-RD-2 is a K footprint with an RMR-to-K plate included, so check your slide cut before reading anything else in the table. Body weight differs by 0.05 oz and the printed dimensions differ slightly, which we leave as printed. The two also differ in reticle color and wavelength, so brightness and reticle choice are not a one-to-one swap. Holosun’s SCS-320-GR page also lists contents from a different model; we do not use an in-the-box list for the SCS-320-GR. Both pages show a price; we do not repeat them here.

Which to pick (on paper)

• If your slide is a SIG P320 optics-ready or DPP cut: the SCS-320-GR lists a direct DPP mount; the EPS-RD-2 is a K footprint.
• If you want a user-replaceable battery: the EPS-RD-2 lists a removable CR1620; the SCS-320-GR lists an internal rechargeable battery that is not removable.
• If you want a solar-assisted optic: the SCS-320-GR lists solar power; the EPS-RD-2 does not.
• If you want a circle-dot reticle: the SCS-320-GR lists a 2 MOA dot and 32 MOA circle, selectable; the EPS-RD-2 lists a 2 MOA dot.
• If you want manual brightness and memory: the EPS-RD-2 lists both; the SCS-320-GR lists automatic brightness.
• If a longer printed battery life matters: 50,000 hours (EPS-RD-2, setting 6) against 20,000 hours (SCS-320-GR).

We have not range-tested these; facts above are from the makers.

Not yet verified

• The SCS-320-GR in-the-box contents (the page listing is from another model).
• A common test basis for the battery-life figures (they use different power sources).
• Prices, which both pages show but we do not repeat.

Related: Holosun SCS Carry vs EPS: solar or battery, Holosun EPS vs Trijicon RMR, all comparisons.

Frequently asked questions

Sources

1. Holosun: SCS-320-GR (checked Nov. 5, 2026)
2. Holosun: EPS-RD-2 (checked Nov. 5, 2026)

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