Optic Adapter Plate - Sig P365X/XL to Trijicon RMR/Holosun "C" Series

(32 reviews) Write a Review

For years, serious shooters have desired to mount Trijicon RMRs to slides with narrow profiles such as the Glock 43, Sig P365 and the Smith and Wesson Shield. We now have a practical answer.

Our RMS to RMR adapter plate mounts directly to the Shield RMS/RMSc optic cut footprint (machined into the slide) and allows the user to mount a Trijicon RMR securely to the adapter plate!


NOTE: This plate is compatible with the Sig P365XL ONLY. If we machined your P365 slide please choose our P365 plate.

Each plate will ship with one set of M3x.5x8mm screws to secure the plate to the P365XL slide, and one set of custom length 6-32 screws. Recommended torque value for all screws is 11in/lbs.



It is solely the responsibly of the customer to ensure the correct fasteners are used and proper safe function of the firearm is maintained. If you have any questions, contact a competent gunsmith for help!



The major advantage of this system is the freedom to choose either to mount the Shield RMS/RMSc series of sights directly to your slide or to choose to mount the battle proven Trijicon RMR!


Our RMS to RMR adapter plate is CNC machined from billet 7075 aluminum alloy (almost twice as strong as the more common and cheaper 6061 Aluminum) and Type 3 Hardcoat anodized black. To minimize unnecessary weight, the plate has had as much material machined away as possible without sacrificing any structural integrity.

32 Reviews Hide Reviews Show Reviews

  • 5
    RMR Type 2 to P365XL adapter

    Posted by LsShaun on Sep 24th 2020

    I went with a Trijicon RMR Type 2 instead of the smaller RMRcc and am glad I did. I enjoy the larger window. Anyhow the adapter plate was great in every way. Very high quality. Thanks for making this item.

  • 5
    Rmr adapter plate for p365 xl

    Posted by Peter on Sep 19th 2020

    Superlative! Fits perfectly. Machined to very precise tolerances! Very pleased!

  • 5
    Great product!

    Posted by J. Harrison on Sep 17th 2020

    This adapter fit my 365XL perfectly. The rounded bottom edges on the adapter give it a nice visual appeal and prevent snags on holsters and clothing. The included screws were a perfect fit for my 507C optic. I've shot roughly 100 rounds using this product and couldn't be more pleased with it. Its a very well thought out adapter with precise machining. If you're considering an optic that needs an adapter, you can't go wrong with this one!

  • 5
    Perfect fit & finish

    Posted by David B on Sep 5th 2020

    Installed a trijicon RMR on a sig p365 xl, Awesome!

  • 5
    Adapter plate

    Posted by Jason Peek on Aug 30th 2020

    Fit as advertised. Could not ask for anything better.

  • 5
    Optic adaptor plate for Sig P365cl and Holosun 507C V2

    Posted by Ronald Svihel on Aug 29th 2020

    Fantastic fit to the XL and the 507C V2. Quick Delivery was 6 days. Wonderful quality. Couldnf ask for better anything!

  • 5
    Dig 365 Adapter Plater

    Posted by Ken on Aug 9th 2020

    Outstanding fit and finish. Tight tolerance no wobble, very secure.

  • 5
    Optic adapter plate for Sig P365 to Trijicon RMR

    Posted by Todd Jones on Aug 1st 2020

    Hey! Something that actually fits like it should Hey! Something that actually fits like it should. Had the adapter plate and Trijicon RMM on my pistol in about 3 minutes while standing on the firing line. . Had the adapter plate and Trijicon RMR on my pistol in about 3 minutes while standing on the firing line. Good job guys!

  • 5
    Optic adapter plate

    Posted by Stephen Reopell on Jul 31st 2020

    Fits great and great quality