If you’re using a pistol slide cut for the DeltaPoint Pro (DPP) footprint, such as the SIG P320, M17, or M18, you’ve likely discovered how limited the red dot options are without relying on adapter plates.
The good news? Holosun with DPP Footprint has delivered a purpose-built solution: the SCS‑320‑GR, a closed-emitter, solar-powered optic made specifically for DPP and Romeo1 Pro slide cuts.
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| 1) Holosun SCS‑320‑GR |  |
What Is the DPP Footprint and Why Does It Matter?
The DPP footprint refers to the mounting pattern used by the Leupold DeltaPoint Pro red dot sight. It’s a specific layout of screw holes and recoil lugs that determines how an optic attaches to a pistol slide or adapter plate.
Footprint is an important consideration in the optic community footprint, too, and a red dot sight can only be mounted on a slide that is the same mounting standard. This is why learning about the DPP footprint is important to purchasing a red dot optic for your handgun.
The most interesting applications of the Leupold DPP footprint are:
- SIG Sauer P320 / M17 / M18 pistols (particularly with Romeo1 Pro cut)
- The Hellcat Pro RDP (with plates) produced by Springfield Armory
- Homebuilds of Glock on DPP-compatible slides or adapters
Why It Matters:
- No Adapter Plates Needed – A DPP-compatible optic (like the Holosun SCS‑320‑GR) mounts directly to slides with a matching footprint, offering a lower profile and better durability.
- Improved Co-Witnessing – Direct mounting helps align the optic with standard or suppressor-height iron sights.
- Wider Compatibility with Duty Pistols – Many law enforcement and military-configured pistols use the DPP pattern, making it a go-to choice for serious users.
Does Holosun Make Any Red Dots with the DPP Footprint?
Yes, but only one. Currently, Holosun has only one red dot product that works with the DeltaPoint Pro (DPP) footprint, the Holosun SCS-320-GR.
This model forms part of the Holosun Solar Charging sight (SCS) and is exclusively designed to attach straight over to the optics-ready SIG Sauer P320 slides cut to the delta point pro Leupold or Sig Romeo1 pro footprint, and can do away with an adapter plate.
Why Only One?
Holosun makes the majority of their red dots on the RMR footprint, such as the 507C, 508T and 509T, the smaller ones, such as the 507K and 407K, come on the RMSc/K footprint. Previously, all of Holosun optics were not compatible with the DPP standard out of the box.
The SCS-320-GR fixed that, offering SIG P320 users a direct mount, solar-powered option with the signature MRS reticle and green illumination of Holosun.
Why Choose Holosun for DPP Footprint Red Dots?
Here’s why Holosun is a top pick:
- Solar-Powered Technology (No CR2032 Needed)
The SCS-320-GR has an internal rechargeable battery, solar charging, and no button batteries to replace. It automatically balances brightness and continues to run in almost any light conditions, even in the house.
- Multi-Reticle System (MRS)
Holosun MRS has the feature where you can get a 2 MOA dot and a 32 MOA circle, or just one, in a single optic. This is so flexible that you can alternate between the speed and the precision, according to your mode of shooting.
- Military-Grade Durability
The SCS-320 is tough and can take duty use, bad weather, and a hard kick, as it is constructed using 7075-T6 aluminum and is rated at IP68 waterproof.
- Direct DPP Mounting = Fit Better
The SCS-320 is form-fitted to DPP/Romeo1 Pro slides, making it low and flush-mountable, and works with standard height sights on co-witness, along with the suppressed-sight height.
- Exceptional Value
As always, Holosun sells high-end specifications at mid-range costs, and the SCS-320 sits among the greatest DJP-ready optics priced below 400 dollars.
Holosun with DPP Footprint
1) Holosun SCS‑320‑GR
And if you run a SIG Sauer P320, or any other pistol that has a Leupold DeltaPoint Pro footprint cut, the Holosun SCS-320-GR is by far the best–if not the only–Holosun optic that has been made with such a footprint in mind.
This Solar Charging Sight (SCS) was custom-made to be able to be directly mounted on directly onto DPP and SIG Romeo 1 Pro optics-ready slides without an adapter plate. That entails a lower setting-up elevation, flawless co-witnessing with iron sights, and a highly streamlined outline.
With a rechargeable internal battery, the SCS-320 has solar auto-adjust brightness and has manual override, i.e., it will be able to suit itself to any light conditions. The green Multi-Reticle System (MRS) can switch between a 2 MOA dot, a 32 MOA circle, or both- perfect to switch between fast acquisition and precision.
Key Specs:
- Footprint: Leupold DPP / SIG Romeo 1 Pro
- Reticle: 2 MOA Dot, 32 MOA Circle, or Both (MRS)
- Power Source: Solar with internal rechargeable battery
- Brightness: Auto + manual override
- Battery Life: Virtually unlimited (solar-charged)
- Material: 7075-T6 aluminum housing
- Window Size: 0.90″ x 0.63″
- Waterproof: IP68
- Weight: Approx. 1.3 oz
Pros:
- Direct DPP mounting, no plate needed
- Solar-powered, no battery replacements
- Slim, snag-free profile
- MRS reticle for flexible targeting
- Perfect co-witness with suppressor-height sights
Cons:
- No removable battery (must rely on solar)
FAQs
- What footprint does the Holosun SCS-320 use?
The Holosun SCS‑320 uses the Leupold DeltaPoint Pro (DPP) footprint, making it compatible with pistol slides cut for DPP or SIG Sauer’s Romeo1 Pro optics.
- Will the Holosun SCS-320 fit my SIG P320?
Yes. The SCS‑320 is specifically designed to mount directly to SIG Sauer P320 models with the DPP or Romeo1 Pro optic, cut no adapter plate required.
- Does the SCS-320 use replaceable batteries?
No. It features a built-in rechargeable battery powered by solar charging. It can run indefinitely under regular use and does not require CR2032 battery swaps.
- Can the SCS-320 work indoors or in low light?
Yes. While it’s solar-powered, the SCS-320 has an internal battery and auto-adjusting brightness, so it works reliably in all lighting conditions, including indoors or at night.
Final Thoughts
The Holosun SCS‑320‑GR is easily one of the best red dot options available and the only Holosun that fits natively.
You get all the innovation Holosun is known for: solar-powered operation, a multi-reticle system, durable construction, and a direct-mount design that co-witnesses perfectly with your iron sights. It’s built for serious shooters who want performance without compromise.
While it comes at a slightly higher price than open-emitter models and lacks a replaceable battery, the reliability, clarity, and zero-maintenance power system make up for it.
Looking for a rock-solid optic for your SIG P320 or DPP-cut pistol? The Holosun SCS‑320‑GR checks every box.