Holosun 509T Mounts – EGW RMR Dovetail & Picatinny Solutions

Holosun 509T Mounts – EGW RMR Dovetail & Picatinny Solutions

Holosun 509T + EGW RMR Mount
The Toughest & Most Affordable Setup in 2025

If you are looking for the strongest and most affordable Holosun 509T mount, you might be surprised to learn you don't need an expensive custom plate. While many aftermarket manufacturers try to sell $130 "direct-mount" solutions with long lead times, the most durable setup is actually already in your hands. By pairing an Evolution Gun Works (EGW) RMR mount with the steel adapter plate included in every Holosun 509T box, you get a rock-solid, multi-material mounting system that costs half the price and ships immediately.

This setup solves the biggest confusion regarding the Holosun 509T footprint. Because the 509T uses a unique clamp-style interface rather than top-down screws, it requires an adapter to fit standard dovetails. Our 7075 T6 aluminum RMR mounts provide the perfect base for Holosun’s 4140 steel RMR-to-509T adapter. This combination offers superior thread engagement and durability compared to soft aluminum-only plates, making it the preferred choice for duty, competition, and hunting applications on platforms like 1911s, CZs, Glocks, and Sig Sauers.

Holosun 509T mounted on EGW RMR dovetail mount using free Holosun adapter plate

No $130 plate. No 10-week wait.
Just your EGW RMR mount + the free adapter that came in the Holosun box.

Find My EGW Mount →
Bottom line: Every single EGW RMR dovetail mount and Picatinny mount works perfectly with the Holosun 509T using the steel adapter plate Holosun includes for free. You will need a Red Dot Adapter Plate or a Picatinny Rail Adapter.

Instant Compatibility Chart – What EGW Mount You Need

Your Firearm EGW Mount (RMR Version) Co-Witness Added Height (adapter only) Price
Novak Rear Sight Cut Firearm EGW 1911 RMR Dovetail Mount None (dovetail/adapter plate) ~0.085" $49.95 Buy →
CZ Shadow 2 OR / P-10C OR / P-07 / P-09 EGW CZ RMR Dovetail Mount None (dovetail/adapter plate) ~0.085" $59.95 Buy →
Sig P226 / P229 / P220 / P210A / Sig #8 Sight Cut EGW Sig Classic RMR Dovetail Mount None (dovetail/adapter plate) ~0.085" $59.95 Buy →
Glock (all models with rear dovetail) EGW Glock RMR Dovetail Mount None (dovetail replacement) ~0.085" $49.95 Buy →
Any rifle, AK, shotgun, revolver with Picatinny EGW HD Picatinny RMR Mount Depends on rail height ~0.085" $49.95 – $79.95 Shop All →

Why This $50–$89 Setup Beats Every $130 “Direct-Mount” Plate

Feature EGW + Free Holosun Adapter $130 Direct Plate
Total cost $49 – $89 $110 – $140
Material stack 4140 steel adapter + 7075 aluminum EGW mount Aluminum only
Warranty Limited Lifetime on EGW mount Usually 1 year
Shipping 1-3 days from Pennsylvania 4–12 week lead times common
Works on rifles & revolvers too? Yes Almost never

Installation

  1. Install EGW Mount
  2. Screw the Holosun adapter to your EGW RMR mount (two 6-32 screws, 15 in-lbs, blue Loctite).
  3. Clamp the 509T onto the adapter – tool-less.
  4. Zero and go.

FAQ

Will I have iron sight co-witness?

No – all EGW dovetail mounts replace the rear sight. This is an optic-only setup, exactly what most serious 509T users run.

Does the Holosun 509T fit directly on an RMR cut?

No. The 509T uses a proprietary clamp. The free adapter plate is required and is included with every optic.

How much height does the adapter add?

Approximately 0.085 inches from the EGW mount surface to the 509T window.

Is the Holosun adapter reliable?

Thousands of competition, duty, and hunting guns run this exact stack with zero reported failures.

Questions? Call (215) 538-1012 or email info@egwguns.com – we answer in minutes.

Dec 16th 2025 Devin

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