Holosun SCS-320-GR

The Holosun SCS-320-GR is the SIG P320 counterpart to the SCS-MOS for Glock. It mounts directly to factory P320 optics-ready slides without an adapter plate, and the underlying interface is the Leupold DeltaPoint Pro footprint, so it also fits any DPP-cut slide or DPP plate-equipped pistol. The result is the lowest-bore-axis enclosed P320 optic on the market and a co-witness with factory iron sights.

Power comes from Holosun's Solar Charging Sight system: an internal rechargeable battery topped off by a solar panel, with a 20,000-hour reserve for indoor or low-light storage. The reticle is a green 2 MOA dot inside a 32 MOA circle with switchable display modes. A 30-minute high-brightness override mode locks the optic at maximum visibility for demanding lighting transitions.

The 7075-T6 aluminum housing is rated IPX8 for water ingress and 5,000G for shock, both more than adequate for duty pistol use. Trade-off: the integrated rechargeable battery is not user-serviceable, and the 0.90 x 0.63 inch window is smaller than open-emitter alternatives like the 507C or 508T. For P320 owners who want a direct-mount enclosed optic without battery management, this is the only purpose-built option in its class at the price point.