Sig M17/M18/X-Five Legion RMR, SRO, 407c, 507C Optic Adapter Plate by EGW

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Sig M17/M18/X-Five Legion Trijicon RMR, SRO / Holosun 407C, 507C Optic Adapter Plate by EGW


Works with:

  • Trijicon RMR / SRO
  • Holosun HE407C / HE407C X2 / HE507C / HE507C X2 / HS407C / HS407C X2 / HS507C / HS507C X2
  • Swampfox Kingslayer / Liberty / Justice

This mount fits:

  • Sig M17 (with Romeo1 PRO cut)
  • Sig M18 (with Romeo1 PRO cut)
  • Sig P320 X-Five Legion (with Romeo1 PRO cut)
  • Sig P320 X-Carry Optics Ready (with Romeo1 PRO cut and no rear sight cut)
  • Sig P320 X-Compact (with Romeo1 PRO cut and no rear sight cut)

This mount does not fit:

  • Any Sig P320 models with dovetail cut for rear sight
  • Sig P320 RX
  • Sig P320 RX X-Compact
  • Sig P320 X-Five (with Romeo1 cut)
  • Sig M17 Military Surplus


  • Material: 7075 Aluminum
  • Coating: Matte Black Hardcoat
  • Overall Length: 2.398"
  • Overall Width: .99"
  • Mounting Hardware: (2) 6-32 Flat Head Screws, (2) 4-40 X 1/4 Set Screws

Our red dot sights are meant to be installed from the left to the right (with the muzzle facing forward). The dovetail has a progressive taper to allow for easier install.

Simply remove the rear sight on your gun and replace it with our mount in order to mount your Trijicon RMR red dot sight. You can take our mount off and replace your rear sight at any time. Mounting hardware included.

Installation Instructions
- Remove the rear sight*
- Install the EGW Sight Mount in the dovetail
- Tighten set screw (if applicable)
- Place the red dot sight on the EGW Sight Mount
(placing a small piece of paper between the red dot sight and the sight mount will make for easier removal and will keep Loctite off of the red dot sight.)
- Apply blue Loctite to the provided mounting screws
- Torque mounting screws to 15in/lbs

2 Flat Head Cap Screws - Provided for Trijicon RMR

The screws that are included with this mount require a 5/64'' allen wrench for installation.

Click here to see a video from Vortex on how to install our red dot base on a slide.

Warning: This product may be alloyed with trace amounts of lead and other elements which are known to the State of California to cause reproductive harm and cancer. To prevent exposure, do not alter the product by welding, grinding, etc. For more information, go to